Alliteration is when a sentence or phrase has words that start with the same sound. It is commonly used in advertising, poetry, headlines, and tongue-twisters. Basically the first consonant repeats itself throughout the sentence.

Alliteration is common for poetry. It was used one thousand years ago in Anglo-Saxon poems. A fine example is a strophe from The Rime of the Ancient Mariner by Samuel Taylor Coleridge:

The fair breeze blew, the white foam flew,

The furrow followed free;

We were the first that ever burst

Into that silent sea.