RBAC has Owner, Contributor and Reader access apart from the multiple other built-in roles meant for different resources within Azure. One can choose to create Custom roles if the built-in roles are not suitable enough.
- The Owner access gives complete control to the resources within the subscription.
- Contributor access is similar to owner except that the user cannot assign access to others.
- The Reader access role allows a user to view all the resources within the tenant.
Refer the page here for the complete list of built-in roles available in Azure.