Simile is one of those figures of speech which is based on resemblance. In this, usually a comparison is made between two objects of different kind or objects or concepts which have at least one point in common. The simile is usually introduced by the words like, as, or, so. A perfect Simile is used as literary tool to declare the similarity and establish relevance between the objects or concepts.
Eg: In summers people start sweating like pigs.