Similes

A Simile is when two things are directly compared because they share a common feature. 
A Simile is a type of metaphor in which the comparison is made with the use of the words LIKE or AS.  
A metaphor also offers a figurative comparison, but 'implied' rather than introduced by As or Like.  

                                 AS ...
*   As wet as a dog's nose
*   As slippery as an eel
*   As slow as a snail

                               LIKE ...
*   His nose was wet, like a dog's
*   Slippery like an eel
*   She was slow like a snail