Summary:

• **What are XMPP, TURN, and STUN?** These are special tools that help computers talk to each other over the internet, kind of like how phones need phone numbers to call each other. XMPP helps send messages between computers, while TURN and STUN help computers find each other and connect even when they're behind special internet barriers called firewalls.

• **Why do we need these tools?** Sometimes computers have trouble connecting directly to each other because of security walls or network setups. TURN and STUN are like helpers that figure out the best way for two computers to talk to each other, making sure messages get through successfully, similar to how a mail carrier finds the right address to deliver a letter.