A data stream is a long line of information that keeps coming in and doesn't stop. It's like a never-ending river of letters, numbers, or other types of data that are constantly flowing. Imagine a long train with cars that are filled with boxes of information, and it keeps coming and coming like it will never stop. That's what a data stream is - a continuous flow of information.
For example, when you take a video call on your computer, you are receiving a data stream of audio and video information from the person you are talking to. This information is sent to your computer in a steady stream, so that you can see and hear the other person in real time.
Some data streams are simple and easy to understand, like a weather report that gives you the temperature and forecast for the next few days. Others can be very complex, like financial data that tracks stock prices and investment trends.
In summary, a data stream is a never-ending flow of information that keeps coming in and can be simple or complex depending on what kind of information it contains.