The quick brown fox jumps over the lazy dog

"The quick brown fox jumps over the lazy dog" is an English-language pangram. This is a sentence that contains all of the letters of the alphabet. 
The "quick brown fox" is often used for touch-typing practice, testing typewriters and computer keyboards, and displaying examples of fonts. It can be used when all the letters in the alphabet need to be typed. Because the short sentence makes sense, it is widely known and used.