The Google Cloud SDK is a set of tools that allows users to manage and interact with Google Cloud Platform services. It includes command-line tools and libraries that help developers and system administrators perform tasks like deploying applications, managing resources, and accessing cloud services directly from their local machines. The SDK supports various programming languages and can be installed on different operating systems, making it versatile for users. It also provides access to the Google Cloud Console, enabling users to automate workflows and streamline their cloud operations efficiently.