A simile is a literary device that compares one thing to another using "like" or "as." An example would be "her eyes are blue like the ocean." This is much like a metaphor, but the difference between a metaphor and a simile is that a simile is not stated as if the two things being compared are actually the same thing. An example of a metaphor would be "her eyes were the blue ocean." Logically, a reader would know that the girl's eyes were not the ocean, but because it is a metaphor, it is stated as if the two are equivalent.
A simile can usually be found by looking for 'like,' 'as,' or another comparison word. The steps to find the similes in "The Tell-Tale Heart" would be as follows:
1. Read the story over once.
2. Scrutinize the descriptive portions for comparative sentences
3. Determine whether or not the comparison sentences are metaphors or similes based on whether it uses a comparison word.
One example of a simile in "The Tell-Tale Heart" is:
His room was as black as pitch.