Client Portal
You may need to restrict access to some information on your site, making it available only to select clients. If so, a Client Portal is the way to go.
You'll manage a Client Portal using the same tools you use for the rest of your website, and you'll access those tools from the same place. They'll enable you to assign certain documents, image galleries, news articles, links, and other resources to an individual, a group, any client with a login - or any combination of such visitors.