The term 'Folder Flap' is a type of closure used to secure the contents of a folder or envelope. It consists of a TAB that is inserted into a slot on the flap of the folder or envelope, which then holds the flap in place. The TAB is usually made of plastic or metal and can be opened and closed with ease. This type of closure is often used for documents that need to be kept secure, such as legal documents or confidential information.