Plenty of WordPress websites are run by only one author. If you have a WordPress community with multiple types of users on-board, you may need to change user roles from time to time. While you don’t necessarily need a plugin to change user roles easily, plugins such as User Role Editor can make the process a whole lot easier. This plugin allows you to define specific access rights for your members. All you have to do is check the right check-boxes and the rest is done by this plugin.
Depending on the type of community you are running, you may want to restrict some of your visitors from messing with your files, themes, comments, categories, and everything in between. This plugin allows you to define role details as you see fit. You also have the option to define new roles, modify existing ones, and get rid of the problematic ones for your website.
If you run a vibrant community using WordPress and want to define custom roles for it, User Role Editor can more than get the job done. It gives you a lot of control.