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What is an API?

Application Programming Interface or an API is a set of rules that allows one application to communicate with another. It defines how to send requests and receive responses, typically over a network. Key characteristics:
  • Facilitates communication between systems.
  • Exposes specific functions or data.
  • Requires manual implementation such as building request payloads, handling errors.
  • Typically language-agnostic such as example, REST, GraphQL.

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What is an SDK?

Software Development Kit or an SDK is a comprehensive set of tools that helps developers build applications for a specific platform or service. It often includes APIs, libraries, documentation, and utilities. Key components:
  • APIs and wrapper libraries.
  • Code samples and documentation.
  • Tools like compilers or debuggers depending on the platform.
  • Language-specific support such as Android SDK for Java/Kotlin, iOS SDK for Swift.

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API vs SDK: A quick comparison

AspectAPISDK
PurposeEnables interaction between systemsFacilitates application development
ScopeFocused on specific functionalityComprehensive toolkit, often includes APIs
Ease of UseRequires manual setupProvides abstractions and ready-to-use code
Language SupportTypically language-agnosticUsually language-specific
Included ToolsNoneOften includes debuggers, emulators, etc.

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Benefits of using an SDK

While APIs are essential building blocks, SDKs enhance the development experience with several added advantages: Faster development: SDKs offer pre-built methods and helper functions, reducing time spent writing and debugging repetitive code. Simplified integration: Common tasks like authentication, request formatting, and error handling are often built-in, minimising setup effort. Platform optimisation: SDKs are tailored for specific languages and platforms, ensuring smoother integration and better performance. Developer-friendly: Bundled documentation, code examples, and utilities help reduce the learning curve and improve onboarding.