If you are purchasing Marketer/Reseller/Developer edition. Then, you need to purchase a subscription of your own server.
You can purchase the server from digitalocean.com by creating a new droplet instance on Ubuntu Latest(18+) version installed on a Linux based setup.
For Marketer edition, 20$/month plan is recommended with maximum RAM in available plan with Digital Ocean.
For Reseller edition, 40$/month plan is recommended with maximum RAM in available plan with Digital Ocean.
For Developer edition, 60$/month plan is recommended with maximum RAM in available plan with Digital Ocean.
For Enterprise edition dedicated AWS Account with 5000$ credits is included with the purchase which covers your server cost. And you don’t need to purchase server separately.