The PUT Method is a technique used in programming and web development, particularly in the context of RESTful APIs. It allows clients to update existing resources on a server by sending a complete representation of the resource. When a client sends a PUT request, it typically includes the updated data, which replaces the current resource at the specified URL. This method is different from the PATCH Method, which only updates specific fields of a resource. The PUT Method is idempotent, meaning that making the same request multiple times will not change the outcome after the first request. This ensures consistency in resource management.