It's a similie, because it compares something to something else.
"My cat stood as still as a statue" means that it was like (or similar to) a statue.
You could have a metaphor that use the same imagery. So
"The instant it saw the mouse, my cat became a statue." This does not imply that the cat actually transformed into a statue, but it uses the metaphor of an unmoving thing to put an image into your head.
This is a simile, as it compares Sam's stillness to that of a statue using the word "as." Metaphors would not use a comparison word like "as."
As still as a statue.
simile its a simile when you use "like"
A metaphor
A metaphor, a simile uses the words like or as.
that man
simile
Metaphor...similes use like or as
simile
simile
A metaphor is a flower. A simile is like (or as) a flower. Both metaphor and simile compare one thing to another. The difference is that a simile uses the words 'like' or 'as', and metaphor doesn't. Metaphor: Life is a fountain. Simile: Life is like a fountain.
"He was a lion in the fight" is a metaphor.