Corba stands for Common Object Request Broker Architecture. Think of Corba as a phone that helps different programs talk to each other so they can work together.
Let's pretend you have a toy box at home filled with different toys that you like to play with. But sometimes, you want to play with your friend's toys that she has at her home.
Now, imagine your friend's toy box is like a program and your toy box is another program. They both have different toys and they can't communicate with each other. But with Corba, they can talk to each other just like you and your friend talk on the phone.
Corba acts like a phone operator, it takes the message you want to send from one program to the other and delivers it. It helps different programs share information and work together to get things done.
So, in simple terms, Corba helps different programs talk to each other so they can share information and work together, just like a phone helps you talk to your friend so you can play together.