**SDK** stands for Software Development Kit, a collection of tools, libraries, and documentation designed to facilitate the creation of applications for specific platforms or frameworks. SDKs provide developers with pre-built functionalities, making it easier to integrate various features such as APIs, user interfaces, and data management systems. By using SDKs, developers can streamline the app development process, reduce time-to-market, and ensure compatibility with the targeted environment, be it mobile, web, or desktop applications, resulting in more efficient development cycles.