The acronym SDK stands for Software Development Kit. An SDK is a collection of software tools, libraries, documentation, and code samples that facilitate the development of applications for specific platforms or frameworks. By providing developers with pre-built functions and guidelines, an SDK simplifies the programming process and accelerates app development. SDKs are used for various purposes, including mobile app development, web services, and integration with hardware or APIs. They are essential for enhancing productivity and ensuring consistent implementation of features across applications.