Alliteration is a literary device where two or more words in a phrase or sentence begin with the same sound, usually a consonant.
Here are some examples:
* Peter Piper picked a peck of pickled peppers.
* She sells seashells by the seashore.
* Big bad bear.
Alliteration is often used to create a memorable and poetic effect, and it can also be used for emphasis or to create a sense of rhythm.