HTTP Methods are a set of request methods used in the HTTP protocol to indicate the desired action to be performed on a resource. The most common methods include GET, POST, PUT, and DELETE, each serving a specific purpose in web communication. For instance, GET is used to retrieve data, while POST is used to submit data to be processed. These methods are essential for the functioning of web applications, allowing clients and servers to communicate effectively. Understanding HTTP Methods is crucial for developers as they define how resources are created, read, updated, and deleted, forming the backbone of RESTful APIs.