What is a metaphor, simile, hyperbole, irony, alliteration, and imagery?

Metaphor: description of one thing using the quality of something dissimilar. ‘A blanket of snow.’ Simile: description of one thing using the quality of something similar. ‘As cold as ice.’ Hyperbole: exaggerated illustration. ‘A brain the size of a walnut.’ Irony: emphasis by opposites. ‘About as dry as a swimming pool.’ Alliteration: repeated sound in two or more consecutive words. ‘Famous phones.’ Imagery: descriptive language that engages the senses. ‘The sound of distant drums made him nervous.’