Hit - A single action on the Web server as it appears in the log file. A visitor downloading a single file is logged as a single hit, while a visitor requesting a Web page including two images registers as three hits on the server; one hit is the request for the .html page, and two additional hits are requests for the downloaded image files. While the volume of hits is an indicator of Web server traffic, it is not an accurate reflection of how many pages are being looked at.

Page Views: Document Views - Hits to pages that are defined as documents. This entry excludes hits to dynamic pages and forms

Visits - Number of times a visitor came to your site. If a visitor is idle longer than the idle-time limit, WebTrends assumes the visit was voluntarily terminated. If the visitor continues to browse your site after they reach the idle-time limit, a new visit is counted. The default idle-time limit is thirty minutes.

Unique Visitors- Individuals who visited your site during the report period. If someone visits more than once, they are counted only the first time they visit

Average Visit Length - Average of non-zero length visits in the log.

Definitions provided by Webtrends