[benoau]

Keep your servers stateless so you can distribute traffic between many instances. It's a very easy model to wrap your head around, I think pioneered by a YC startup a very long time ago called Heroku.

All it really means in practice is you wouldn't store things like session state on your web server, server #1 can't hold your information because server #2 or #3 or #85 might receive your next HTTP request. I think dev in general shifted to this model about 15 years ago anyway!