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The Security Connector is an option. It is only required if you want to let website visitors login to the website
not required that requires a package to be installed in Salesforce. This install lets visitors log into the Sitecore website using credentials stored in a Salesforce Contact or Lead record. The Security Connector overrides the ASP.NET membership provider so user data is only stored in Salesforce but appears in Sitecore in the “Salesforce” domain. After installing the Security Connector it is possible to control the Sitecore user membership information, roles and profiles from Salesforce. Note there are two ways to implement roles - choose only one:
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