Word completion is a common feature in web browsers and similar text entry contexts. When a user begins the entry of a frequently-used word, the computer automatically completes it, or proposes a list of choices.

For example, when entering "www.microsoft.com" in the address box of Internet Explorer, a user may find that typing "www.mi" is sufficient. At this point, hit the down-arrow key and the enter key, and voila!.

The feature is often called tab completion, as in some software such as Bash the completion of a string is invoked by hitting the tab key.

The Pocket PC comes with word completion, because tapping away at 5 to 10 wpm is frustrating, even for hunt-and-peck typists. Imagine being able to tap "frus" and then click on "frustrating" or "frustration" to complete the word!

In Microsoft's Visual Basic IDE, word completion is triggered with the Control-spacebar key combination. While typing arguments to a method, however, lengthy lists leap up at you.