When we want to talk to someone far away, like when we use a phone, we need a special device called a "satellite" to help us send our message. But sometimes, even the satellite needs help to talk to other satellites that are far away from it. That's where "inter-satellite communication satellites" come in!
You can imagine these inter-satellite communication satellites as being like messengers who help different satellites talk to each other. They have special communication equipment on them which helps them send messages between the different satellites.
These inter-satellite communication satellites are really important for things like space exploration and communication. They help us get information from all over space, which is really far away and hard to reach. And without these special messengers, our messages might get lost in space!