“Buffering” is when your online device pauses mid-task. Your system will put your task on hold until enough data is downloaded to allow the music or video stream to play without lag. Though buffering may be annoying at first, it’s meant to help you stream more fluidly. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.