Bitlbee is a special program for your computer that lets you use instant messaging apps like WhatsApp, Facebook Messenger, and Telegram all in one place. It's like having a big house where all your friends can come over and you can talk to them from one room instead of having to run around the house to find them.
Bitlbee is like a robot that speaks to all these different apps and translates what you say to them and what they say back to you. So, if you say "hello" to Bitlbee, it will understand what you mean and then say "hello" to all your friends in the different instant messaging apps.
Bitlbee is really helpful because sometimes your friends are using different apps and it can be hard to keep track of who's where. Bitlbee helps you keep everything organized so you can talk to all your friends easily.