Permission levels in SharePoint are -
* Limited Access - They can view Application Pages, Browse User Information, Use Remote Interfaces, Use Client Integration Features etc.
* Reader - Limited Access permissions plus: View Items, Open Items, View Versions, Create Alerts, Use Self-Service Site Creation, View Pages.
* Contributor - Read permissions plus: Add Items, Edit Items, Delete Items, Delete Versions, Browse Directories, Edit Personal User Information, Manage Personal Views, Add/Remove Personal Web Parts, Update Personal Web Parts.
* Design - Contribute permissions plus: Manage Lists, Override Check Out, Approve Items, Add and Customize Pages, Apply Themes and Borders, Apply Style Sheets.
* Administrator - Has full control of the Web site.
* Full Control - All permissions.