What is a simile alliteration personification and metaphor?

Figurative language.

A metaphor is a comparison without the use of like or as. f(ie., a star is a diamond in the sky).

A simile is a comparison with the use of like or as. (ie., a star is like a diamond in the sky).

Alliteration is a saying that uses the same sound over and over again. (ie., bobby buys birthday balloons, or sally sells sea shells at the sea shore).