RankBrain
A Google AI system for understanding relationships between words and concepts. It is not a switch optimised through a fixed keyword density.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
Technology, explained clearly. Find a term, choose a letter or narrow the topic. Definitions include sources and their review date.
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Clear filtersRanking factors
Signals search systems use to order results. Their importance depends on query and system; no complete public table of fixed weights exists.
Definition and sourcesRansomware
Malware or a campaign demanding ransom through data blocking and disclosure threats. Isolated backups and recovery exercises limit damage but do not eliminate disclosure risk.
Definition and sourcesRaster image
An image represented by a pixel grid, such as a photograph. Pixel dimensions describe spatial detail; PPI relates those dimensions to print size. Enlargement usually involves interpolation and may reveal limited detail.
Definition and sourcesRate limiting
Limiting operations per time period for a key such as account or IP. It mitigates abuse but needs consideration of shared addresses.
Definition and sourcesReact
A library for building interfaces from components. Complete applications also need routing, data-fetching and deployment decisions; React alone does not decide everything.
Definition and sourcesReadable URL
A URL clearly describing a resource with a predictable structure. It should be stable; renaming needs proper redirects rather than cosmetic shortening alone.
Definition and sourcesReal-time marketing
Marketing responding to current events and context. Publishing quickly should not replace verification of facts, tone and brand fit.
Definition and sourcesREDAXO
A PHP content management system with extensions. Choose add-ons and content modelling to fit the website and available support.
Definition and sourcesRedis
A data store using memory and structures including lists, sets and hashes. It can support caching and queues. Durability depends on configuration; Redis need not hold only temporary data.
Definition and sourcesRefactoring
Changing internal code structure without intended changes to observable behaviour. Tests help preserve contracts while improving readability and maintainability.
Definition and sourcesReferral traffic
Traffic attributed to visits from another website under analytics rules. Missing referrer information and campaign configuration can affect classification.
Definition and sourcesRegression tests
Checking whether a change damaged previously working behaviour. Scope should follow risk and dependencies rather than test counts alone.
Definition and sourcesRelative URL
A URL resolved against a document's base address, such as ../contact. Its destination can change when the page or base element changes.
Definition and sourcesRemarketing
Advertising to people who previously had a defined interaction. It requires appropriate data, consent and platform compliance rather than unrestricted tracking.
Definition and sourcesRemarketing lists for search ads
A historical acronym for using previous-audience lists in search advertising. Check Google Ads for current segment names and requirements.
Definition and sourcesReplication
Copying data changes between instances through a defined mechanism. Replicas can reproduce accidental deletions and therefore do not replace independent backups.
Definition and sourcesRepository
A location holding a project and version history, such as Git. Repository access and copies need protection, especially against publishing secrets.
Definition and sourcesResponsive display ads
Google Ads creatives assembled from supplied images, text and other assets. The platform adapts combinations to placements; all submitted assets need review.
Definition and sourcesREST
An architectural style with constraints including statelessness and a uniform interface. Using HTTP and JSON alone does not make an API RESTful.
Definition and sourcesReturn on ad spend
Attributed revenue or conversion value divided by ad spend. It is not margin or profit and needs reliable values and attribution.
Definition and sourcesReverse DNS
Resolving an IP address to a name using PTR records. Address-space operators usually control it; matching reverse DNS alone does not authenticate email senders.
Definition and sourcesReverse proxy
A server accepting client requests and forwarding them to backend services. It may handle TLS or caching and must protect trust headers and private content.
Definition and sourcesRich results
Enhanced search-result presentations with additional information. Valid structured data can establish eligibility, but display depends on search systems.
Definition and sources