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 18 / 685
Clear filtersCache-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 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 sourcesCAPTCHA
A mechanism reducing automated abuse through behavioural assessment or challenges. It is not infallible; accessibility and privacy need consideration.
Definition and sourcesChamilo
A learning management system providing courses, materials and assessment tools. Deployment requires access configuration and protection of learner data.
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 sourcesConcrete CMS
The former name of Concrete CMS, a content system with in-context page editing. Older installations need compatibility and update-support assessment.
Definition and sourcesContao
A PHP CMS using Symfony components. It manages website content and structure; extensions have their own requirements and support lifecycles.
Definition and sourcesCookies
Small pieces of data stored by a browser for a website, used for sessions, preferences, analytics or advertising. Cookies are not programs. Consent requirements depend on purpose and applicable rules.
Definition and sourcesCoppermine Photo Gallery
A PHP application for publishing and managing photo galleries. Existing installations need checks of version, environment requirements and security updates.
Definition and sourcesCopywriting
Writing that supports a communication goal, such as explaining an offer or encouraging contact. Effective copy connects the reader's needs with concrete information. Persuasion does not justify unsupported promises.
Definition and sourcesCore Web Vitals
Core user-experience metrics: LCP, INP and CLS. Field data describes real visits, while laboratory measurements support diagnosis and comparisons.
Definition and sourcesCrocoblock
A family of WordPress JetPlugins for features such as dynamic content, filtering and forms. Supported editors depend on the product and version. The complete set does not necessarily behave identically across all builders.
Definition and sourcesCross-browser compatibility
A website's ability to work correctly in agreed browsers. Pixel-identical appearance is not essential; accessible content and key functionality matter.
Definition and sourcesCSS (Cascading Style Sheets)
A stylesheet language describing document presentation, including colour, typography and layout. It works with HTML and differs from programming languages such as JavaScript. The cascade determines which declarations apply.
Definition and sourcesCSS framework
Rules, tools or components that help style interfaces, offering ready-made elements or utility classes. A CSS framework does not replace HTML or guarantee a correct layout without proper implementation.
Definition and sourcesCTA (Call to Action)
A prompt for a specific action, such as booking a call or downloading a guide. It can be a button, link or text. It should explain the next step and deliver what it promises.
Definition and sourcesCumulative Layout Shift
A visual-stability metric measuring unexpected layout shifts. Scores reflect shift size and distance; reserving image space helps reduce the problem.
Definition and sources