What is Architecture Diagramming?

Architecture diagramming is the process of creating visual representations of software systems. Diagrams show how different software components interact with each other and with external systems. Because software is inherently abstract, architecture diagrams help illustrate how data flows within complex systems, making it easier to understand than reading code.

Maintaining architecture diagrams benefits software engineers and their organizations in several ways.

Collaboration

Architecture diagrams significantly boost collaboration between developers, designers, and system stakeholders and create a unified view of system functionality. They can help uncover potential design issues or demonstrate complex systems to non-technical audiences. A shared understanding of an entire system, application, or website supports communication during the design process, helps teams develop effective system components, and ensures a project meets its goals. Architectural diagrams can be effective tools in system handover, employee onboarding, stakeholder communications, and other key touchpoints across a software development project.

Risk reduction

Architecture diagrams can help developers identify potential risks, such as incorrect assumptions in the design process, faulty coding logic, or components that might have received inadequate testing. By identifying and addressing risks early in the software development lifecycle, development teams can make changes before they become more complex later in the development cycle.

Read about the software development lifecycle »

Efficiency

Because architecture diagrams provide a clear view of system components and structure, stakeholders can identify problems and resolve them more quickly. Diagrams also make it easier to maintain and scale systems, so you can make ongoing changes more efficiently.

Scalability

Architecture diagrams allow stakeholders to identify effective ways to scale software systems. A diagram can show new developers how a system's architecture is centralized or distributed. Graphical representations also provide insights into how data is stored and moved so that stakeholders can identify potential bottlenecks.

Software architecture models are a series of design principles and best practices that are used to develop software systems. Software architecture models provide a framework for structuring software and addressing specific challenges in complex software architectures.

Here are some of the most commonly used software architecture models.

Client-server architecture

The client and server are separate applications that communicate over a network. Servers provide the resource or service, and clients request it. A web browser and a web server are examples of client-server architecture.

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Service-oriented architecture (SOA)

Service-oriented architecture allows for interactions between distributed application components through services. Services are abstract, loosely coupled, and language-independent. Applications access services through interfaces. Services are often designed to be reusable, so developers don't have to rebuild new architecture components from scratch. SOA is widely used in distributed systems, as services can be deployed across multiple servers. This model has evolved into a microservices architecture model.

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Microservices architecture

Developers use a microservices architecture to build, deploy, and manage small, individual services. Applications are split into independently deployable services that communicate through APIs.

Smaller, independent services make it simpler for teams to develop, test, and deploy applications and deliver improved fault tolerance and rapid scaling. An example of a microservices architecture is a web application consisting of several independent services, each responsible for specific tasks. An e-commerce application might have separate microservices for managing user accounts, catalogs, searches, and its shopping cart.

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Read about APIs »

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Cloud-native architecture

A cloud-native architecture is used to design and build applications for cloud environments. It prioritizes automated deployment and management so that applications can be scaled up and down as needed. Cloud-native architecture is built and delivered with technologies that are well-suited to the cloud, such as containers and serverless computing. Teams most often use DevOps principles to manage cloud-native architectures.

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Read about serverless architectures »

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Event-driven architecture (EDA)

Event-driven architecture is based on the production, detection, and consumption of events. User interactions, background tasks, and other sources trigger events that further trigger other functionality.

Unlike traditional request/response architecture models, an event-driven system allows the producer to send an event and move on. For example, an e-commerce shopping cart might send "Order Complete" and move on immediately. Decoupling events like this helps make sure that failures in one service do not affect the entire application. It is also a highly scalable design model.

Layered architecture

Layered architecture is a software architecture model that separates applications into logic-based layers. This type of architecture is designed to simplify complex applications and systems by splitting tasks between layers. Each layer communicates with the one immediately above or below it.

Layers are organized from top to bottom, for example:

• A presentation layer (for example, a UI) at the top
• A business layer in the middle
• A data layer at the bottom

Layers can also be structured hierarchically, which aids maintenance and scalability.

Here are some common types of symbols and information found in an architecture diagram:

• Squares and circles can represent components such as databases, networks, applications, and services
• Lines and arrows can show the connections and interactions between the system's components
• Labels can provide additional information about the components and connections

Additionally, the diagram may also use icons to visually represent different components. A small legend at the bottom, similar to the legend on a map, explains icon usage. The way in which the components and connections are arranged is called a layout.

Engineers will also often use Diagrams as Code (DaC) approaches. Instead of manually drawing shapes, they write text-based definitions in a DaC tool that renders into diagrams automatically.

Several types of architectural diagrams visually represent various systems and software architectures. Here are some of the most common architecture diagram examples.

Software architecture diagram

Software architecture diagrams visually represent software components, services, their relationships, and system interactions. They help stakeholders make informed decisions about software implementation. These diagrams can be high-level “summaries,” showing key component interactions at a glance, or be more detailed, depicting data movement, communication, and dependencies.

System architecture diagram

System architecture diagrams provide a visual illustration of a computing system's structure and various components. They can show how infrastructure components such as application servers, databases, and switches communicate and interact with each other.

Application architecture diagram

Application architecture diagrams provide a complete view of an application and the data flow between its components. As with software and system diagrams, these are used to inform the application's design, implementation, and maintenance.

Integration architecture diagram

Integration architecture diagrams visually represent components, data, and technology involved in integration solutions. They show the relationships between different components. These diagrams are used to document and explain internal and external systems as well as plan and develop new integration solutions.

Deployment architecture diagram

Deployment diagrams visually represent relationships between different application components and their deployment environments, including, for example, servers, storage, and networks. They’re often used to plan capacity, scalability, and fault tolerance.

DevOps architecture diagram

DevOps architecture diagrams visualize the components of a DevOps system and how they interact. They commonly include components such as development environments, continuous integration and continuous delivery pipelines, infrastructure-as-code components, and related cloud services. The diagrams illustrate the interactions between these components and their places in the wider DevOps environment.

Read about infrastructure as a service. »

Frontend architecture diagrams

Frontend architecture diagrams map the logic and structure of the client-side application. Unlike simple website architecture diagrams that show page hierarchy, these diagrams illustrate the component tree and how the User Interface (UI) interacts with backend APIs. These diagrams help stakeholders understand how data moves from a backend service to the user's screen without creating performance bottlenecks.

AWS offers a range of services to help with architecture design and development of your infrastructure and applications:

• Workload Discovery on AWS is a tool to visualize AWS Cloud workloads. Use this AWS Solution to build, customize, and share detailed architecture diagrams of your workloads based on live data from AWS.
• AWS Infrastructure Composer is a tool to visually compose modern applications from 1,000+ AWS resources with little guesswork. Infrastructure Composer allows you to rapidly generate ready-to-deploy infrastructure as code (IaC) for enhanced resources, writing in code or building visually.

Get started with architecture diagramming on AWS by creating a free AWS account today.