Here are the SEO definitions for words beginning with U—
2: URL rewriting
4: User agent
UPDATE: Basic SQL command used to modify one or more rows of a data table.
URL rewriting: The practice that translates incoming URL requests to requests for other URLs. You use URL... Entry archived, click here to see full entry
Usability: The ease of use exhibited by a web site.
User agent: Any user or web spider accessing a web site; also refers to the string sent... Entry archived, click here to see full entry