软件开发工具包（Software Development Kit, SDK）一般是一些被软件工程师用于为特定的软件包、软件框架、硬件平台、操作系统等创建应用软件的开发工具的集合。

它或许只是简单的为某个进程设计语言提供应用进程接口的一些文档，但也可能包括能与某种嵌入式系统通讯的复杂的硬件。一般的工具包括用于调试和其他用途的实用工具。SDK还经常包括示例代码、支持性的技术注解或者其他的为基本参考资料澄清疑点的支持文档。

软件工程师通常从目标系统开发者那里获得软件开发包。为了鼓励开发者使用其系统或者语言，许多SDK是免费提供的。SDK经常可以直接从互联网下载。有时也被作为营销手段。例如，甲产品或许会免费提供构件SDK以鼓励人们使用它，从而会吸引更多人由于能免费为其编程而购买其构件。

A software development kit (SDK or "devkit") is typically a set of software development tools that allows the creation of applications for a certain software package, software framework, hardware platform, computer system, video game console, operating system, or similar development platform. To create applications, you have to download a specific software development kit. For example, the development of an Android app requires an SDK with Java, for iOS apps an iOS SDK with Swift, and for MS Windows the .NET Framework SDK with .NET. There are also SDKs that are installed in apps to provide analytics and data about activity. Prominent examples include Google and Facebook.