"The quick brown fox jumps over the lazy dog" is a 35-letter
pangram (a phrase that uses all the letters of the alphabet) that has been used to test
typewriters and
computer keyboards because it is nicely coherent and short. It was known in the late 19th century, and used in
Baden-Powell's book
Scouting for Boys (1908) as a practice sentence for signalling. In later years, the phrase was popularized by
Western Union and the
Telephone Company to test
Telex/
TWX data communication equipment for accuracy and reliability. It was often used for testing the
teletype services (a procedure known as "foxing") when these machines were still used. In the age of
computers, it is often used as a sample text in
font selection contexts. Typing =rand (1, 1) in Microsoft Word 2003 or earlier runs the phrase for the purpose of creating sample sentences and paragraphs, however it is estimated that this relates to the origin of the phrase as a use in testing keyboards.
See more at Wikipedia.org...