The word "piece" is usually used as a noun to refer to a thing or a part of something.
Harold ate a piece of pie.
Would you like a piece of cake?
I ate a piece of pizza for lunch.
There are 500 puzzle pieces for this jigsaw puzzle.
Minh bought a big piece of land for a farm in Wisconsin. (piece of land = usually a large area of land without buildings or houses)
That’s a beautiful piece of land.
Moonlight Sonata is a beautiful piece of music.
Many famous pieces of art can be found at the Art Institute in Chicago.
Following an accident, you can see pieces of cars lying in the street.
A lamp fell off of the table and shattered in a thousand pieces.
The queen is the most powerful piece in the game of chess.
In monopoly, players move their pieces around the board by rolling dice.
There are other ways to use the word "piece."
We’re hoping to get a piece of the action. (a piece of the action = sharing in the benefits)
Zelda gave her coworker a piece of her mind. (a piece of one’s mind = a very strong opinion)
Patty fell to pieces upon learning that her husband was not faithful to her. (fall to pieces = become upset)
The police pieced together what happened on the evening of the young man’s disappearance. (This sentence uses "piece" as a verb. piece together = figure out)
I read an interesting piece in the newspaper the other day. (piece = article, editorial, or opinion)
John said the test was a piece of cake. (piece of cake = easy)
In anger, the man tore up the contract into tiny pieces.
Note: Don’t confuse the word "piece" with the word "peace."