Meaning – An appendage is an application program routine that is provided to assist in handling a particular occurrence. Simply put, an appendage is an extra bit of attachment that assists users in either solving a specific occurrence or even helps users in understanding the file or package in question.
The difference between the word append and appendage is that the word append refers to the process, while appendage refers to the attachment itself. The appendage is usually kept crisp and short in order to retain the attention of the individual.
Example of usage – “The appendage that came with the software helped all kinds of users install it and use it the way its meant to”.