What are Service Accounts?
Service Accounts are "headless" Cloud 66 accounts - they are like team members that cannot log into the UI. They allow you to set up automation tasks or notifications that are not bound to a real person's account.

More info:
Link to docs - Using service accounts: https://help.cloud66.com/rails/account/service-accounts.html
Link to blog - Introducing Service Accounts: https://blog.cloud66.com/introducing-service-accounts/