For enterprices to cover their Ubuntu estate - servers and workstations.
See Ubuntu Pro pricing
Anyone can use Ubuntu Pro for free on up to 5 machines, or 50 if you are an officialUbuntu Community member.
If you were an active customer before January 26th, 2023 you can try Ubuntu Pro for up to 1 year - until the end of your current contract. At the end of the trial, you can choose to upgrade to full Pro (at extra cost), or remain with your current plan.