U

Unique Visitor -

Visitors to a website. It is the best measurement of how many people actually come to a website.

URL -

Abbreviation of Universal Resource Locator. This is a unique address that identifies a website. E.g. yourwebsite.com.au

User Session -

Instance of an Internet user accessing your web site for a certain period of time. During a user session any number of pages may be accessed. A user session is considered finished once an arbitrarily chosen period of inactivity - typically 30 minutes - is exceeded.