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A quick brown fox illustrates the best-known English pangram by jumping over a lazy dog.

The pangram is greatly used everywhere including defence training institutes.

"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.^[1] 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, as indicated in many reports of shortwave radio listeners to communications magazines or to services such as QTH.net.^{[citation needed]}

An example of the phrase being used to display fonts.

In the age of computers, it is often used as a sample text in font selection contexts.

In Microsoft Word 2003 or earlier, typing =rand(x,y), where x and y are integers, then press Enter at the end of the sentence causes the original sentence to be replaced by the phrase repeatedly for x paragraphs and y sentences per paragraph. It is estimated that this relates to the origin of the phrase as a use in testing keyboards.

In Windows, the sample text message is stored inside Fontview.EXE, which can be seen when using Font Viewer. In Windows 3.1 or higher, the sentence became The quick brown fox jumps over the lazy dog. 1234567890, which also tests numbers. In Windows XP, an alternative message Jackdaws love my big sphinx of quartz. 123456890 is added, depending on the combination of locale settings and supported code page table in the font being viewed. In addition, localized versions of Microsoft Windows use different sample texts when viewing local language fonts. In Windows Vista, the Jackdaw phrase is no longer available, but the alternative localized string feature is still available.

This section does not cite any references or sources. Please improve this section by adding citations to reliable sources. Unverifiable material may be challenged and removed. (August 2007)

• Filler text
• Lorem ipsum
• ETAOIN SHRDLU
• Pangram

• Sentences that contain all letters commonly used in a language
• List of English sentences that contain all letters of the alphabet
• Sentences in other languages that contain all letters of the alphabet
• Pangrams in Russian, English and some other languages
• The panagram homepage
• In Vista, jackdaws appear to be somewhat endangered