What distinguishes a metaphor from a simile?

A metaphor is characterized by providing a direct comparison between two unrelated things without using the words "like" or "as," which are typically used in similes. By stating that one thing is another, a metaphor creates a more profound and often imaginative representation, allowing for a richer understanding of the subject being described. This allows the writer to convey complex ideas or emotions more succinctly and powerfully than if they were to simply describe the characteristics.

For example, saying "Time is a thief" directly equates time with a thief, suggesting that time, like a thief, can steal moments from our lives without explicitly stating a similarity, which is what a simile would do. This direct nature is what sets metaphors apart, making them a crucial literary device for adding depth and meaning to language.