Filler text, aka placeholder text or dummy text, is text that shares some characteristics of a real written text, but is random or otherwise generated. It may be used to display a sample of fonts, generate text for testing. The process of using filler text is sometimes called greeking, although the text itself may be nonsense, or largely Latin, as in Lorem ipsum.

"The quick brown fox jumps over the lazy dog" is an English-language pangram, a sentence that contains all of the letters of the alphabet. It is commonly used for touch-typing practice, testing typewriters and computer keyboards, displaying examples of fonts, and other applications involving text where the use of all letters in the alphabet is desired. Owing to its brevity and coherence, it has become widely known.