Long ago, before money was invented, people traded things with each other! This was called bartering. If a farmer had extra eggs and needed new shoes, they could trade their eggs with a shoemaker. If a fisherman caught lots of fish, they could trade some fish for bread from a baker. People swapped the things they had for the things they needed. It worked, but sometimes it was hard to find someone who wanted exactly what you had!
Today, we mostly use money instead of bartering. Money makes trading much easier because everyone agrees on what it is worth. You can use coins, bills, or even a card to buy what you need at a store. But people still trade sometimes! You might trade a sandwich with a friend at lunch or swap toys with your neighbor. Whether we use money or trade things directly, people have always found ways to share and get what they need from each other!