A relational data stream management system is a type of computer program that helps you manage data streams. It takes data (like numbers, words, pictures, or other information) that is sent over a network connection, stores it in a organized way, and then helps you use it in efficient and useful ways. For example, if you receive a lot of information from different people, like sales figures or customer feedback, the system can help you organize it and make it easier to view or search.