A "stub" is a term used in various contexts, primarily in computing and programming. In software development, a stub is a piece of code that simulates the behavior of a component or module that is not yet implemented. This allows developers to test and integrate parts of a system without needing the complete functionality. In the context of documents, a stub can refer to a small portion of a document that remains after the main content has been removed, such as a receipt or ticket stub. These stubs often serve as proof of purchase or attendance, providing essential information like dates and amounts.