Final answer:
Metaphors and similes are two rhetorical devices commonly used in writing. Metaphors compare two things by saying they are the same, while similes use 'like' or 'as' to compare two things.
Step-by-step explanation:
Two rhetorical devices commonly used in writing are metaphors and similes. Both are figures of speech that make comparisons. A metaphor compares two things by saying they are the same, while a simile uses the words 'like' or 'as' to compare two things. For example, in the sentence 'Her smile was a ray of sunshine,' the metaphor compares the smile to sunshine, while in the sentence 'Her smile was as bright as the sun,' the simile compares the brightness of the smile to the sun.