When a writer describes one thing by comparing it to something else, he is using

a. figurative language

b. description

c. hyperbole

d. concrete language

The authors often use figurative language that involves some kind of comparison between different things. We distinguish such types of figurative language as metaphor, personification, pun, simile, symbolism and hyperbole. For example the author takes the terms "as" or "like", it means he uses a simile. The author uses the metaphor when he creates the direct connection between objects. So, you know that the metaphor and the simile are types of figurative language. The answer is figurative language.