PNG
A raster format with lossless compression and transparency. It preserves sharp edges well but can produce larger photographic files than lossy formats.
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 685 / 685
Polyfill
Code providing functionality missing natively from an environment. It needs trusted sourcing and dependency checks; not every platform feature can be reproduced.
Definition and sourcesPop-up
A layer or window appearing over content. It needs a justified purpose, easy dismissal and focus management, especially for keyboard users.
Definition and sourcesPortfolio
Selected work showing an author's skills and approach. It should distinguish real projects, concepts and the author's personal contribution.
Definition and sourcesPostgreSQL
An open-source object-relational database with transactions and extensive SQL support. Performance also depends on schema, indexes, queries and configuration.
Definition and sourcesPotentially unwanted program
Software classified as potentially unwanted, for example due to aggressive ads or bundled additions. This classification does not always mean a virus.
Definition and sourcesPresell pages
A historical name for article pages created primarily for SEO links. Value depends on content and intent; manipulative linking schemes violate policies.
Definition and sourcesPrestaShop
An open-source PHP e-commerce platform with modules and themes. Payment, extension and update compatibility need assessment for each store.
Definition and sourcesPrint finishing
Techniques changing printed material's appearance or properties, including varnishing, laminating, foiling and embossing. Not all involve coatings. Results and durability depend on the substrate, process and prepared artwork.
Definition and sourcesPrint production
Preparing and producing printed publications, including typesetting, file preparation, printing and finishing. Technology and material parameters should follow the requirements of the particular production job.
Definition and sourcesPrivacy notice
Information explaining who processes personal data, why, on what basis and for how long. It must reflect actual processes and applicable transparency obligations. Copying a document does not establish GDPR compliance.
Definition and sourcesPrivate browsing
A mode limiting retained browsing history and session data after windows close. It does not automatically hide activity from websites, employers or internet providers.
Definition and sourcesProduct ads
Product ads displaying data such as image, price and seller. In Google they rely on product data and the rules of the relevant campaign format.
Definition and sourcesProgrammatic SEO
Creating many pages from structured data and templates. Each page needs genuine value; mass-producing empty variations can constitute spam.
Definition and sourcesProgressive web app
A web application using platform capabilities for app-like behaviour. Installation, offline operation and notifications depend on implementation and browser support.
Definition and sourcesPrompt
Input and instructions supplied to an AI model. Context and response criteria affect output, but a good prompt guarantees neither correctness nor safety.
Definition and sourcesProof of concept
A limited experiment testing the feasibility of a concept. Success does not establish production readiness, scalability or long-term maintenance cost.
Definition and sourcesPuTTY
A terminal-connection client particularly known for SSH. Obtain it from a trusted source and verify host keys when connecting.
Definition and sourcesPython
A high-level programming language with dynamic typing, used in automation, data analysis and server applications. Readable syntax can aid learning, while correctness and performance still depend on the design.
Definition and sourcesQUIC
A UDP-based transport with secure connection establishment and multiple streams. It underpins HTTP/3; using UDP does not mean lacking reliability.
Definition and sourcesQuota
An allocated resource limit, such as storage, file count or API requests. Exceeding it can stop operations despite available system-wide capacity.
Definition and sourcesRankBrain
A Google AI system for understanding relationships between words and concepts. It is not a switch optimised through a fixed keyword density.
Definition and sourcesRanking 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 sources