A buffer may refer to any of the following:
1. When referring to memory, a buffer is a temporary storage in the memory that stores information while processing other information.
2. Online buffering happens while streaming music and videos before they play. Buffering lets you watch or listen to media almost instantly by downloading a small portion and then playing the file while the remainder downloads.
If your Internet connection is fast enough, you should only buffer for a few seconds when you first start playing the media and never need to buffer again. If your computer or device frequently buffers, your connection is not fast enough, or there's a problem with your connection or the streaming provider.