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-: In the previous section

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we discussed various types of APIs

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and we concluded that Web APIs is the most popular

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and most useful kind of API.

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So let's dive a little bit deeper into Web APIs

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and explain what it is exactly.

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So, let's remind ourselves

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the definition of Web API that we have used.

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An API exposed by a web component,

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allowing other component to interact with it.

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It's important to remember

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some common characteristics of Web API.

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First, Web API is platform agnostic

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meaning .NET components, for example,

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can easily communicate with Python component using Web API.

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And of course this is true also for other platforms.

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In addition, Web APIs use standard protocols

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usually over HTTP as you see in this diagram.

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And also Web API usually using request/response

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meaning when we have a core component,

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in this case the .NET component,

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which is calling the Python component,

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then the .NET component will request or will send a request

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based on the HTTP protocol to the Python component

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and we'll receive back an HTTP response.

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This is part of the HTTP protocol,

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and almost all kinds of Web APIs

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will use this paradigm of request response.

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Now, when discussing Web API types

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we should understand what is the difference

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or what is the main differences between them.

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So the Web APIs are differentiated

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mainly by the request format.

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It could be JSON or XML or anything else.

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The request content.

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What is the content of the request

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that is sent over the web?

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The response format.

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Again, is JSON or XML or Clear text or something else.

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And of course the response contents.

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What is the content of the response

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sent by the server back to the client.

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So with that in mind,

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let's explore the various types of Web APIs.

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First, SOAP,

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and REST, GraphQL and gRPC.