Mandi in Uttar Pradesh is a place where farmers or growers go to sell their crops like wheat, rice, fruits, and vegetables. Just like when you go to a store to buy things, farmers go to mandi to sell their things. But instead of a store, it's like a big market where the farmers meet buyers who want to buy their crops.
When farmers bring their crops to mandi, they have to follow certain rules. They have to weigh their crops so that buyers know exactly how much they are buying. Then they have to set a price for their crops. This can be a little tricky because they want to make sure they make enough money, but they also don't want to set the price so high that nobody wants to buy it.
Buyers also have to follow rules. They can't just take the crops without paying for them. They have to pay the farmers for their crops. This is important because farmers need to make a living to provide for their families.
Sometimes, mandi can get very busy, especially during harvest season. There are lots of farmers and lots of buyers all trying to buy and sell crops. But it's an important place for farmers to sell what they grow and for buyers to get the food they need to eat.