This screen displays all the roles existing within your multisite network.
Role Name: WordPress uses role name to identify that role.
Display Name: WordPress uses display name to display this role within the site. You can have different display names for the same role within the network. When a role has different display names, this plugin displays all names in separate lines.
Role Type: Displays whether that role is a built-in role or a custom role.
Sites: Display the sites that role belongs to. [All Sites] mean, that role is part of every site within the network. Else it will display the number of sites as a link. Clicking on the link will display the site list.