Just like people can talk to each other, molecules can also talk to each other! They send messages through tiny signals that only other molecules can understand. It's like speaking in a secret language that only certain people can hear.
Just like how you can use your ears to hear people talking, molecules have special receptors that can pick up these signals. When a molecule receives a message, it can respond by sending its own message back or by changing its behavior in some way.
Scientists are trying to use this molecular communication to create tiny devices that can communicate with each other. These devices could be used for all sorts of things, like monitoring our health or helping us explore other planets.
It's a pretty complicated topic, but it's really exciting to think about all the possibilities for the future!