Price impact is how much your trade might move the market price. Think of it like shopping at a small store. If you buy half of all the apples they have, the price might go up because there aren’t many left. But if you did the same at a big supermarket, the price probably wouldn’t change because they have lots more apples.
In trading, if there’s a lot of an item (like a stock or cryptocurrency) available to buy or sell, it’s called having good “liquidity”. If something has good liquidity, big trades don’t change the price much. But with poor liquidity, even smaller trades can shift the price a lot.
In DeFi, which is like a digital marketplace for trading, this is really important. Some digital items might not have much liquidity, which means their prices can be more sensitive to trades. So, when trading in DeFi, it’s crucial to be aware of the price impact to ensure you don’t get a bad deal or change the price more than you intended.