Frame

1. Edge or border that resembles a border of frame you may find on a picture. Frames are often used in word processing and graphic arts to help focus the viewer's attention. 
2. In data or network communications, a frame is a block of data that begins with a header to indicate the beginning of the block of data and a trailer to indicate the ending of the data. 
3. With the Internet, a frame is a movable or non-movable portion of a web page to help make the navigation easier. Many users do not like frames because of various issues such as printing a page, book marking a page with the relevant information and not a separate frame, etc... 
4. A frame is a single still image frame displayed by the computer, video hardware or software application. Also see FPS and frame rate.

Also see: FPS, Frame grabber, Frame Rate, Game definitions, Packet, Video definitions