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Definition
An SDK, or Software Development Kit, is a collection of tools, libraries, documentation, and code samples that developers use to build applications for a specific platform, framework, or service. SDKs typically include APIs, debuggers, and other utilities that simplify and accelerate the development process.

Why it matters
SDKs streamline application development by providing prebuilt components and clear integration guidelines. They help reduce development time, ensure compatibility with the target platform, and improve reliability by offering standardized, tested tools.

Example use case
A mobile developer uses the Android SDK to build a new app. It includes all the necessary tools, such as emulators, code libraries, and documentation, allowing the developer to efficiently create, test, and deploy the app on Android devices.