A pie is a type of pastry that is usually filled with fruit, but it may also contain meat.
A cherry pie is filled with cherries.
An apple pie is filled with apples.
A pot pie is filled with meat, usually chicken.
A pizza might be referred to as a "pizza pie."
The filling of a pie is the inside of the pie. The outside of the pie is called the crust. The crust is made from dough. The video below provides instruction for making a cherry pie, but my intention is for you to benefit from the use of the vocabulary words in the video:
When cutting into a pie, each section is called a piece or a slice.
Would you like a slice of pie?
Would you like a piece of pie?
Small pies are often cut into eighths, so there are eight pieces of pie.
There are a few expressions that use the word "pie."
If something is as American as apple pie, that makes it very American.
If something is "easy as pie," it's very easy.
If something is pie in the sky, it's something imagined or dreamed about but not real.
A pie chart is useful when looking at data. All sections of a pie chart equal 100%.
He's using a pie chart to explain the company's recent performance.