What do the following terms mean regarding Web stats?

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URL: https://support.webservio.net/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=134
Article ID: 134
Created On: 19 Sep 2012 10:20 AM

Answer Total Unique Sites This identifies how many hosts have accessed your site. For example, Comcast.net may be a host.

Total Unique Users This identifies how many users have not been to your site before. A user gets to your site using an Internet host.

Total Unique Referrers This identifies which sites people use to get to your site. For example, a user may come through Google.

Total Unique Usernames This will identify the number of accesses to your site based on a user name if they are required to sign in.

Total Unique User Agents - This will identify the different browsers or programs used to access your site. For example, someone may be browsing through Internet Explorer.