SDK
/ˌɛs-diː-ˈkeɪ/
n. “Here are the tools. Please don’t reinvent them.”
SDK, short for Software Development Kit, is a bundled collection of tools, libraries, documentation, and conventions designed to help developers build software for a specific platform, service, or ecosystem. An SDK exists to answer a simple but expensive question: “How do I do this the right way without guessing?”