Companies are like big pizzas
Imagine a company is a giant pepperoni pizza. Now picture the pizza cut into 1,000 slices. Each slice is called a SHARE. A STOCK is just the whole pizza — the type of company you can own slices of.
Owners share the profits
When you buy a share, you become a tiny owner of that company. If the company does great, your slice can become more valuable, and sometimes the company even sends you a thank-you gift called a DIVIDEND.
Why prices move
If lots of kids want the pizza, slices cost more. If nobody wants pizza today, slices get cheaper. That's how stock prices go up and down every single second.