Unnatural links
Unnatural links: Google describes unnatural links as “creating links that weren’t editorially placed or vouched for
Upsell
Recommending a more expensive product to increase order value.
Uptime
The percentage of time a website remains accessible.
URL
URL: (Uniform resource locator) This refers to the web address for your website (e.g. www.nameofwebsite.com); it is like a postal address for your website and all the files, documents and images that it includes.
URL parameters
URL parameters: Information add to a URL after a question mark (?) to change page
Usability
Usability: This term refers to how "user friendly" a web site and its functions are. A site with good usability is a site that makes it easy for visitors to find the information they are looking for or to perform the action they desire. Bad usability is anything that causes confusion or problems for the user. For example, large Flash animations served to a visitor with a dial up connection causes poor usability. Easy, intuitive navigation and clear, informative text enhance usability.
User Engagement
User Engagement: Data that shows the level of interaction users have with your site
User Journey Mapping
User Journey Mapping: A diagram that visually illustrates the user flow through your site.
User Sitemap
User Sitemap: An HTML page with links to all pages on your website so that
UTM code
UTM code: An urchin tracking module (UTM) is a simple code that you can append to