The Mexican peso is the money that people use in Mexico to buy things like toys, food, and clothes. Just like how you have dollars to buy things, people in Mexico have pesos.
The Mexican peso has pictures of important people and symbols that are important to Mexico, like the famous artist Frida Kahlo and the ancient Maya pyramid of Chichén Itzá.
Sometimes, the value of the Mexican peso compared to other types of money, like the US dollar, can change. This means that sometimes you might be able to buy more things in Mexico with the same amount of dollars, and other times you might be able to buy less.
But no matter how much the peso is worth, it is still very important to the people who live in Mexico because it helps them buy the things they need to live their lives.