A ReplicaSet is a Kubernetes controller that keeps a specified number of identical Pods running, replacing any that fail or disappear from…
Replication lag is the delay between a change committing on a primary database and the same change becoming visible on a replica…
Reputation management in public relations is the ongoing work of shaping, monitoring and protecting how stakeholders perceive an organization over time.
Requests per second (RPS) measures how many requests a server completes each second, a core server performance metric read together with latency…
Reranking is a second retrieval stage that rescores a shortlist of candidate documents with a stronger model so the most relevant ones…
A reserved instance in cloud economics is a one- or three-year commitment to specific compute capacity in exchange for a discount on…
Resolution in video is the number of pixels in each frame, stated as width by height, which sets the maximum detail a…
Resource saturation is the state in which a server resource has more work than it can process, so requests queue and latency…
Response time is the elapsed time between a client sending a request and receiving the server's complete answer, including queuing, processing and…
A responsive grid is a layout grid whose columns, gutters and margins adapt at breakpoints so one design works on phones, tablets…
Responsive text is web typography that adapts to screen size, zoom and user font settings so content stays readable without loss or…
A REST API exposes resources at URLs and lets clients manipulate them with standard HTTP methods in stateless requests that return JSON…
A restoration test restores a backup to a separate environment and verifies the result, proving that server data can actually be recovered…
Retail media is advertising sold by retailers and marketplaces on their own sites, apps and audiences, using first-party shopper data to reach…
Retargeting is a digital advertising technique that shows ads to people who already visited a website, used an app or interacted with…
A retry policy defines when, how often and how quickly an automated system repeats a failed operation before giving up or escalating…
A return value is the result a function hands back to its caller when it finishes, a core programming idea for passing…
Returns in e-commerce are the process of taking back sold goods, from authorization and reverse shipping to inspection, disposition and refund or…
Revenue per mille (RPM) is the amount a creator actually earns per 1,000 views after the platform's share, used to compare monetization…
Reverb is the dense pattern of sound reflections that follows a source in a space, recreated as an audio effect to add…
Reverberation in acoustics is the dense, decaying sound that persists in a space after the source stops, built from many overlapping reflections.
A review response is a business owner's public reply to a customer review on a platform such as Google Business Profile, shaping…
An RFC (Request for Comments) is a numbered, permanent document in the series that publishes Internet standards, best practices and protocol specs.
RGB is the additive color model that builds colors from red, green and blue light, used for screens, digital images and color…
A ribbon microphone uses a thin metal ribbon in a magnetic field to convert air velocity into voltage, giving a smooth sound…
Rich results are enhanced search listings with ratings, prices, images or other details that search engines build from a page's structured data.
The right of access lets individuals confirm whether an organization processes their personal data and obtain a copy with details about its…
The right to erasure lets individuals require an organization to delete their personal data without undue delay when a legal ground applies.
The right to rectification lets individuals require an organization to correct inaccurate personal data and complete incomplete data without undue delay.
The right to repair is a set of consumer rules requiring makers of devices to provide spare parts, repair information and fair…
A ring light is a circular LED lamp placed around a camera or phone that lights a creator's face evenly from the…
A ripple edit trims or changes a clip on the timeline and automatically shifts all following clips so that no gap or…
Risk assessment in robot safety is the structured process of identifying hazards of a robot application, estimating their risk and deciding on…
RJ45 is the common name for the eight-pin modular connector used on twisted-pair Ethernet cables, ports and patch panels in wired networks.
RLHF (reinforcement learning from human feedback) trains a language model to prefer responses that people rate higher, using a learned reward model.
Roam like at home is the EU rule that lets mobile customers use calls, texts and data in other EEA countries at…
Roaming lets a mobile subscriber use calls, texts and data on a partner network outside the home operator's coverage, usually in another…
ROAS, or return on ad spend, measures the revenue generated for each unit of advertising spend and guides budget decisions in performance…
A robot is a programmable, actuated machine that senses its environment and moves with some autonomy to manipulate objects, position tools or…
A robot gripper is the end effector that grasps, holds and releases objects, driven by electric, pneumatic, vacuum or other actuators at…
A robot joint is the movable connection between two links of a robot arm, rotating or sliding under actuator control to give…
A robot simulator is software that models robots, sensors and environments with physics so robotics teams can develop and test behavior virtually.
A robot vacuum is an autonomous cleaning appliance that maps a home, navigates around obstacles and vacuums floors on a schedule or…
A robotaxi is a driverless vehicle that carries paying passengers on demand within a defined area, without a human driver on board.
Robotic Process Automation (RPA) uses software robots that operate application user interfaces like a person to run repetitive, rule-based business tasks.
Robotics is the engineering discipline that designs, builds and programs machines able to sense, decide and act physically in the real world.
Robots.txt is a plain-text file at a site's root that tells web crawlers which URL paths they may crawl, shaping crawling and…
A rollback undoes every change made by a database transaction that has not committed, returning the data to the state it had…
Rolling shutter is a sensor readout method that exposes and reads image rows one after another, which can skew or wobble fast-moving…
A rollup is a blockchain scaling design that executes transactions off the main chain and posts their data and results back to…