Imagine you are playing a game of telephone with your friends. You pass a message to your friend and then they pass it on to the next friend until it reaches the last person. The message has to pass through a lot of people to get to the person it was intended for, and sometimes the message can get lost or changed along the way.
Middleware is like a helper who makes sure the messages get through to the correct person and in the correct way. In computer terms, middleware is a software layer that sits between different software applications, just like how your helper sits between your friends during the game of telephone. It helps these applications communicate with each other by translating messages from one format to another so that they can understand each other.
For example, when you browse the internet and click on a link, the request goes through middleware which translates the message into a language the web server can understand. The web server processes your request and sends a response back to middleware in a language it can understand. The middleware then translates the response into a language your browser can understand, and voila! You have your web page.
Middleware helps different applications talk to each other without having to know all the details about each other. It takes care of the technical details so that you can focus on using the applications without worrying about how they communicate with each other.