Imagine you are playing a game with your friends, and you and your friends need to agree on the rules of the game before you start playing. In the same way, when companies are making a new product, they need to decide what the product should do before they start making it. This is called "requirements".
Requirements Interchange Format (RIF) is a way for people to write down these requirements in a special computer language that makes it easier for different people and different computer programs to understand and work with the requirements. It's like having a special language just for talking about what the product should do!
The RIF is like a big dictionary that tells people and computer programs what words mean and how to use them to talk about requirements. This helps everyone understand each other and work together to make the product as good as possible.
Overall, RIF is a way to write down what a product needs to do so everyone can understand and work on it together more easily!