a designated point set by a user that positions the cursor in a particular spot on a page. In word processing, tab stops can be useful for setting recurring margins, paragraph indentions, and other repeated parameters in a document.
A tab stop on a typewriter is a location where the carriage movement is halted by mechanical gears. Tab stops are set manually, and pressing the tab key causes the carriage to go to the next tab stop. In text editors on a computer, the same concept is implemented simplistically with automatic, fixed tab stops.