What Does Buffer Mean?
A buffer is a temporary holding area for data while it’s waiting to be transferred to another location. It is usually located in the RAM. The concept of the buffer was developed in order to prevent data congestion from an incoming to an outgoing port of transfer.
Techopedia Explains Buffer
For example, when a user downloads a video or audio file, a certain percentage of the downloaded file is placed in the buffer and then played. As the clip is played, the device continuously downloads the file and places it in the buffer. Because of this, there is less chance that the video or audio file will stall when network congestion occurs, unless of course the download rate is so slow that the play speed catches up with it.