UI (User Interface)
The means through which a person operates a system, including graphical elements, text, touch or voice. UI is part of user experience; button appearance does not account for all UX.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
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Clear filtersUnit tests
Tests of a small unit of code behaviour. They should detect meaningful regressions; mirroring implementation in assertions can create false confidence.
Definition and sourcesUnpublished ad post
An advertising post not published as an ordinary profile post and targeted to an audience. This does not make it invisible in platform transparency tools.
Definition and sourcesUpselling
Offering a more capable or expensive version of the selected product. It should fit the need and differs from selling a separate complementary product.
Definition and sourcesUptime monitoring
Periodic service-availability checks from defined locations. Reports depend on frequency and criteria; monitoring on the same VPS can fail alongside it.
Definition and sourcesURL (Uniform Resource Locator)
An address identifying a resource and how to access it. It can include a scheme, host, path, query and fragment. Not every URL has every component, and multiple addresses can reach the same resource.
Definition and sourcesURL Rating
Ahrefs' metric for the relative backlink-profile strength of a specific URL. It differs from Domain Rating and is not a Google score.
Definition and sourcesUser journey
A description of user steps, goals and difficulties in context. Journey maps should be research-based; an ideal imagined path does not replace observation.
Definition and sourcesUser-Agent
A header describing the client's declared software, such as a browser or crawler. It can be spoofed and should not be sole identity proof.
Definition and sourcesUser-generated content
Content created by users, such as comments and reviews. It needs moderation, abuse controls and publishing rules and is not automatically trustworthy.
Definition and sourcesUX (User Experience)
A person's experience with a product, service or organisation, including understanding, usability and feelings before, during and after use. UX extends beyond screen aesthetics and digital products.
Definition and sources