Unique visitor:  A real visitor to a Website (versus a visit by a search engine robot). Web servers record the IP addresses of each visitor, and this is used to determine the number of real people who have visited a Web site. If someone visits twenty pages within your site, the server will count only one unique visitor and twenty page accesses (the page accesses are all associated with the same IP address)

Return Visitor:  A single user that has returned to your site after at least 24-hours and was previously counted as a unique visitor.

Hits:  Also called a page hit. The retrieval of any item, like a page or a graphic, from a web server for example, when a visitor calls up a web page with four graphics, that's five hits, one for the page and four for the graphics. For this reason, hits often aren't a good indication of web traffic.

Hosts:  Every time one connects to the internet, it is done through and internet service provider.  In this scenario, the host is the ISP and the number associated with that ISP.  This information can be useful in determining localized demographics.

Robot/spiders Visitors:  The operation of reading or analyzing pages of a website by an automated program called a spider or robot.  Spiders crawl your web site by following links on each page of your site. After crawling, the spider will return the results back to the search engine for later inclusion into its database for indexing.

Visits Duration:  This statistic is often misleading.  The 0 to 30 second category generally shows the most traffic, but that is due to the automated process of spiders/robots.  A better indicator is the average visit duration.

Pages-URL:  This will show the trends when someone visits a website.  It will indicate the most visited pages of the website. 

Links from an external page:  This section indicates if your website is listed on any other directories/websites.  I.e. if you were a member of the chamber of commerce and contacted them to list your website on their directory.  When a visitor would go to the chamber’s website and then click on your link, this would calculate in this section.

Keyphrases:  This is a list of all phrases that visitors typed into a search engine and then clicked on your website.