Apache Qpid is a type of software that helps computers talk to each other. It's kind of like a translator between different computer programs.
Imagine you have two friends who speak different languages. One friend speaks Spanish and the other speaks French. You want them to be able to talk to each other, but they don't speak the same language. That's where you come in as the translator. You listen to what one friend says in Spanish and then tell the other friend what was said in French. Apache Qpid does this same thing, but for computer programs instead of people speaking different languages.
When different computer programs need to talk to each other, they use different "languages" or protocols. Just like how different countries have different official languages. Apache Qpid helps translate between these different protocols, so the programs can understand each other and communicate.
So, Apache Qpid is like a translator that helps different computer programs understand and communicate with each other, even if they use different "languages" or protocols.