A trade card is like a small piece of paper that a business gives to people to tell them about their products or services. It's sort of like a mini advertisement. They usually have pictures of what the business sells or offers, along with information about the business like its name, address, and phone number. Sometimes, they even have a special offer or discount on them. People can collect trade cards from different businesses to learn more about them and what they have to offer. It's like collecting stickers, but with information about different stores!