The PATCH method is an HTTP protocol method supported by a server to partially modify or update a resource represented by the target URI. It is used to make minor updates to an existing resource by only sending the specific changes rather than replacing the entire resource. The PATCH method is typically used in situations where there is a partial change to a resource or where a complete replacement is not necessary or desirable. It is considered a safer and more efficient method than methods that require the complete replacement of a resource.