Answer:
A simile.
Explanation:
A simile is a figure of speech that compares two unlike things using the words "like" or "as". It creates a vivid image in the reader's or listener's mind by highlighting similarities between the two things being compared. For example, "Her smile was as bright as the sun" is a simile because it uses the word "as" to compare the brightness of the smile to the brightness of the sun.