Standard profiles in Salesforce

Standard profiles cannot be deleted and permissions cannot be edited.

System Administrator	View and modify all data, customize app.
Standard User	View, edit, and delete records they can access.
Solution Manager	Standard User plus they can manage published solution.
Marketing User	Standard User plus they can import leads.
Contract Manager	Standard User plus they can manage contracts.
Read Only	Only view records they can access.

Cheers!!!