Dev Hub: New Limited Access License
Looking to use the Dev Hub in your production or business org but don’t have a Salesforce user license? Look no further. The Salesforce Limited Access - Free license lets developers access the Dev Hub to create and manage scratch orgs.
Scratch Orgs: Configurable Salesforce Environments
Designed to be ephemeral and easily recreated, scratch orgs are dedicated and configurable Salesforce environments that you can quickly spin up for many different purposes. They can be your own personal development environment, or you can create headless scratch orgs for automated tests. You can create scratch orgs if you turned on Dev Hub in your production org or a Developer Edition org, or have a Dev Hub trial org.