A fraction is a part or piece of something.
If I were to cut a whole pizza into 4 equal parts, each piece would represent a quarter of the whole pizza and if we were to write it a fraction it would be written like this:
1 / 4
The 1 would represent one piece of pizza and the 4 would represent the 4 pieces of pizza.
The number on the bottom of a fraction is called the denominator. And it represents the number of parts the whole pizza was cut into: 4 Parts.
We would cover this topic in details in later tutorials.