One of the most basic features of administering user Web Site permissions is through the creation of roles.
Rather than assigning individual permissions to each user, roles are used to assign specifically selected permissions to selected users. The use of roles allows greater control over groupings of permissions and also makes it easier to assign or remove a role (thus multiple permissions) from a user.
For example assigning the role of "Author" to select authenticated users can be used to allow them to write and publish articles on your Web Site. Permissions for the "Author" role could open the permissions under "Node", "Article", - "Create new content", "Edit new content", and Delete own content" that other users and/or roles do not have. If a user no longer writes for your Web Site, Their User Profile can be quickly modified by removing the "Author" role and thus, all the permissions assigned under that role.
Your first step is to go to Administration/People/Permissions/Roles. Once there you will find three default roles of "Anonymous", "Authenticated", and "Administrator" along with a text box allowing the addition of a custom role.