Cache
Storage of data for reuse, such as a saved HTTP response. Caching reduces delays and repeated work. Expiration and invalidation matter; private responses must not be indiscriminately stored in a shared cache.
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.
Terms 60 / 685
Clear filtersCache and microcache
Caches store responses or computation results for reuse. Microcaching uses short lifetimes; private and session-specific content needs exclusion from shared caches.
Definition and sourcesCache-Control
An HTTP header defining response storage and reuse. No-cache requires validation, while no-store prohibits storage; these directives are not interchangeable.
Definition and sourcesCakePHP
A PHP MVC framework with data-access tools and application conventions. Select its version together with PHP requirements and support lifecycle.
Definition and sourcesCallout asset
Additional short ad text highlighting an offering's feature. It is not a separate clickable link; claims must comply with rules and reality.
Definition and sourcesCanonical URL
The preferred address for duplicate or closely similar content. HTML usually expresses it with a link element using rel="canonical". Search engines treat it as a signal rather than an unconditional indexing instruction.
Definition and sourcesCanva
A design platform with an editor and templates. Rights to use elements, photographs and templates depend on licensing and intended use.
Definition and sourcesCAPTCHA
A mechanism reducing automated abuse through behavioural assessment or challenges. It is not infallible; accessibility and privacy need consideration.
Definition and sourcesCase study
An account of a specific implementation, its context, actions and outcomes. A useful case study explains measurement methods and limits to its conclusions.
Definition and sourcesCC email field
The email carbon-copy field, labelled DW in Polish interfaces. Addresses are normally visible to other recipients; it does not hide a contact list.
Definition and sourcesCDN (Content Delivery Network)
Distributed infrastructure delivering content from multiple locations. A CDN can cache assets and reduce origin-server load. Node selection depends on routing and configuration, not necessarily physical proximity.
Definition and sourcesChamilo
A learning management system providing courses, materials and assessment tools. Deployment requires access configuration and protection of learner data.
Definition and sourcesChaos engineering
Controlled disruption experiments used to test system resilience. They require hypotheses, observation and bounded impact; randomly stopping services is insufficient.
Definition and sourcesChatGPT
An OpenAI service for conversation and work with AI models, including text and information tasks. Tools vary by version and plan. Results need checking; ChatGPT is not the name of one fixed GPT-3 model.
Definition and sourcesCI/CD
Practices for frequent integration and automated delivery. Continuous delivery maintains release readiness; continuous deployment may automatically deploy accepted changes.
Definition and sourcesCisco
A vendor of networking, security and collaboration solutions. Cisco names a company and product brand rather than one networking protocol.
Definition and sourcesCitation Flow
Majestic's proprietary metric estimating link-profile influence from link relationships. It is neither a Google metric nor independent proof of website quality.
Definition and sourcesClick-through rate
Clicks divided by impressions, usually expressed as a percentage. It helps assess response to messaging but does not replace conversion and cost analysis.
Definition and sourcesClickbait
A headline or presentation designed to provoke clicks, often at the expense of accuracy. High CTR alone does not demonstrate content quality or usefulness.
Definition and sourcesCloaking
Showing search crawlers different content from users to manipulate results. Not all legitimate personalisation is cloaking; purpose and implementation matter.
Definition and sourcesCloud computing
A model for on-demand access to shared computing resources. Cloud changes infrastructure delivery but does not automatically transfer all application responsibility.
Definition and sourcesCloudflare
A network-services provider offering CDN, DNS, application protection and the Workers computing platform. Services operate differently. Enabling Cloudflare does not replace application updates or correct access configuration.
Definition and sourcesCluster
Cooperating nodes performing a shared task. A cluster can support scaling or availability but does not guarantee resilience to every failure.
Definition and sourcesCMS (Content Management System)
Software for editing and publishing content through an administration interface. It can manage websites, blogs or other material. Some changes still require developers; a CMS does not imply unlimited editing without code.
Definition and sources