Division is splitting into equal parts or groups. It is the result of "fair sharing".
Example: there are 12 chocolates, and 3 friends want to share them, how do they divide the chocolates?
Answer: They should get 4 each.
We use the ÷ symbol, or sometimes the / symbol to mean divide:
12 ÷ 3 = 4
12 / 3 = 4
See division in action here. Notice that there is often an amount left over called the "remainder":