Web Deploy is a tool that simplifies deploying web applications and websites to IIS servers. It allows seamless integration with IIS Manager, Visual Studio, and WebMatrix for creating deployment packages and deploying them locally and remotely. Web Deploy uses providers and operations to process source and destination data during deployments. It also uses rules to handle specific tasks like synchronization and parameterization. Administrators can use Web Deploy to export packages from their development environment and import them into other environments like testing and production servers.