SDK
Software Development Kit
Tools and libraries for building applications on a platform.
An SDK bundles libraries, documentation, sample code, and tools that developers use to build applications for a specific platform or service. From a security standpoint it is part of the software supply chain, so a compromised or vulnerable SDK can introduce flaws or malicious behavior into every app that includes it. Practices such as verifying sources, pinning versions, and reviewing third party components help reduce the dependency risk an SDK can carry.
Looking SDK up is step one. Getting tested on it is step two.
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