When you visit websites, your browser will save some information in its cache and cookies. Clearing them can fix certain problems, and can also improve video streaming quality.
For most web browsers, you can open the menus used to clear your cache, cookies, and history by pressing the Command-Shift-Delete keys together on your desktop keyboard (Mac users) or Ctrl-Shift-Delete keys (Windows users). For instruction on desktop and via mobile devices, see below:
On a Desktop:
On an iPhone/iPad:
On an Android phone or tablet: