Unique user / Unique Visitor: Unique user means a single visitor (or user) of a website. Unique users are very important of a website because that indicate the success of a website. A visitor can visit multiple pages with a website. If a website has high visitor count and low pages per user counts that indicates website is not attractive to the visitors and need to rework. If a website has low visitor count and high pages per counts then that indicates the success of the website.

Upload: Upload means one system send information to anther.

URL: URL (Uniform Resource Locator) means in an HTML-coded source file server and path information used to locate another document.

URL Submission: URL submission is process of requesting the search engines to index the web pages URL’s using online forms.

User Agent: On web a program that access documents for any purpose. Link checking programs, download managers, indexing robots and web browsers for search engines are all user agents.