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How does hosting a Discord Bot work since there is no port forwarding, and you do not know my ip address?

So i've been making and using my Discord bot (written in javascript) for about 5 months, ive learnt quite a bit and it works nicely. Only thing is, i dont understand how it actually works in terms of hosting? I have it running at home 24/7 on a raspberry pi but i mean, and ive hosted websites at home too, so i've done port forwarding etc for my websites, but you dont have to do that with a discord bot? Can anyone explain how it all works?