You do know there are search engines on the internet? Ones that will tell you far faster than we can to start at https://confluence.atlassian.com/cloudkb/pros-and-cons-of-cloud-vs-server-691011844.html
No, you did not. You asked what the differences were.
That document is a useful guide to the main differences, so it answers the question you asked.
Your new question can also be found with search engines very easily. But you'll find that Server is a system you run yourself (or ask a provider to run for you) and Cloud is broadly the same software, but run by Atlassian for you.
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot