In software development, the acronym "SDK" stands for Software Development Kit. An SDK is a collection of tools, libraries, documentation, and APIs that developers use to create applications for specific platforms or frameworks. It simplifies the development process by providing pre-built solutions and enabling developers to focus on building unique features. SDKs often include testing tools, sample code, and debugging utilities, facilitating integration with other software systems. By utilizing SDKs, developers can enhance productivity, maintain consistency, and accelerate the application development lifecycle.