Clean URL

The query string parameters dictate the content to show on the page, and frequently include information opaque or irrelevant to users—such as internal numeric identifiers for values in a database, illegibly encoded data, session IDs, implementation details, and so on.Clean URLs, by contrast, contain only the path of a resource, in a hierarchy that reflects some logical structure that users can easily interpret and manipulate.For search engine optimization purposes, web developers often take this opportunity to include relevant keywords in the URL and remove irrelevant words.Common words that are removed include articles and conjunctions, while descriptive keywords are added to increase user-friendliness and improve search engine rankings.Websites that make use of slugs include Stack Exchange Network with question title after slash, and Instagram with ?taken-by=username URL parameter.
Uniform Resource Locatorsusabilityaccessibilitywebsiteweb applicationweb servicedecoupleuser interfacesearch engine optimizationrepresentational state transferweb resourcesWorld Wide Webbookmarkingserver-side scriptbroken linkssearch engineuser agentssecurityquery stringidentifiersdatabaseencodedsession IDsURL mappingrewritingarticlesconjunctionsfragment identifierhuman-readablebasenamefilenameLatin scriptwhitespace charactershyphenunderscorebrowser extensionhyperlinkedfile nameStack Exchange NetworkInstagramInformation architecturePermalinkPersistent uniform resource locatorURL normalizationURL redirectionURL shorteningCanonical link elementJakob NielsenTim Berners-Lee