Free Starter Licenses: 1-domain limit (unlimited subdomains), 1 worker process and 2 GB RAM limit.
Site Owner Licenses: 5-domain limit (unlimited subdomains) ,1 worker process and 8GB RAM limit.
Site Owner Plus Licenses: 5-domain limit (unlimited subdomains) ,1 worker process and no RAM limit.
Web Host Lite Licenses: Unlimited domain limit , 1 worker process and 8GB RAM limit.
Web Host Essential, Web Host Professional, and Web Host Enterprise Licenses: These license are differentiated by the number of worker processes spawned. No domain or RAM limits.
Web Host Elite: This option is for those who want to be able to configure the number of worker processes. It has no domain or RAM limit.
Peace Out!