An object in object-oriented programming is a runtime unit that bundles state and behavior, created from a class and identified independently of…
Object detection is the computer vision task of finding objects in an image and labeling each with a class, a bounding box…
Object recognition in robotics is the perception task of identifying which known objects appear in sensor data and where they are, so…
Object storage is a cloud storage model that keeps data as whole objects with metadata and keys in a flat, highly scalable…
Object versioning keeps every overwritten or deleted version of an object in a cloud storage bucket so that earlier data can be…
OBS Studio is free, open-source software that mixes cameras, screens and audio into a live stream or recording for Twitch, YouTube and…
Obstacle avoidance is the robot navigation capability that detects obstacles near the robot and adjusts its motion in real time to prevent…
An occupancy grid is a robot navigation map that divides space into cells, each holding the probability that the cell is occupied…
OCR (optical character recognition) is the computer vision task of converting text in images and scanned documents into machine-readable, searchable text.
OCSP is the Online Certificate Status Protocol, which lets clients ask a responder whether a specific X.509 certificate has been revoked.
ODF (OpenDocument Format) is an open, XML-based ISO standard for office documents such as text files, spreadsheets and presentations, used by many…
OFDMA is the Wi-Fi multiple access method that splits a channel into resource units so an access point can serve several devices…
Off-camera flash is a flash photography technique that fires a flash unit away from the camera to control light direction, shape and…
An office suite is a bundle of productivity applications, typically a word processor, spreadsheet and presentation program, sharing formats and an interface.
Offline web is the set of browser techniques that let a mobile website or web app load and work without a network…
Ogg Vorbis is an open, royalty-free lossy audio format that pairs the Vorbis codec with the Ogg container, widely used in games…
OLED is a display technology in which every pixel emits its own light, giving true blacks, fast response and wide viewing angles…
Omnichannel in e-commerce is a retail model that connects online stores, apps and physical shops into one consistent customer experience.
A one-to-many relationship in data modeling links one record in a parent table to any number of records in a child table…
The Online Safety Act is the UK law of 2023 that imposes duties of care on online services to tackle illegal content…
An online store is a website or app where a business presents products, takes orders and accepts payment, forming the core unit…
The OOM killer is the Linux kernel mechanism that ends a process with SIGKILL when the system or a cgroup runs out…
OPcache is the PHP extension that stores compiled script bytecode in shared memory, removing repeated parsing and compilation to raise server performance.
Open captions are captions burned permanently into the video image, always visible to every viewer and independent of the player's caption support.
Open gate is a video camera recording mode that captures the full usable sensor area, usually in a taller 3:2 or 4:3…
Open-loop control drives a robot actuator with commands computed in advance from a model, without measuring the output to correct errors during…
Open rate is the email marketing metric showing the share of delivered emails recorded as opened, measured with a tracking pixel and…
Open source describes software whose source code is released under a license that lets anyone use, study, modify and redistribute it for…
An open standard is a publicly available specification, developed openly and implementable by anyone, that lets software from different vendors interoperate.
OpenAPI is a vendor-neutral specification for describing HTTP APIs in a machine-readable YAML or JSON document used for documentation, code and testing.
OpenLiteSpeed is the open-source, event-driven edition of LiteSpeed Web Server, known for fast PHP handling through LSAPI and built-in page caching.
OpenTelemetry is an open, vendor-neutral standard and toolkit for generating, collecting and exporting traces, metrics and logs from cloud applications.
OpenTofu is an open-source infrastructure as code tool that provisions cloud resources from declarative HCL files and forked from Terraform in 2023.
OpenXR is the royalty-free Khronos standard API that lets XR applications run on headsets from different vendors through one common interface.
An operating system is the core system software that manages a computer's hardware, runs programs and provides common services to applications and…
Optical flow in video and VFX is a per-pixel estimate of how image content moves between frames, used for retiming, motion blur…
Optical stabilization in photography moves a lens element to counter camera shake, allowing sharper handheld images at slower shutter speeds.
Opus is an open, royalty-free lossy audio codec that handles both speech and music at low latency, from 6 to 510 kbit/s,…
Oracle Database is a commercial multi-model relational database system known for read consistency, PL/SQL, clustering and enterprise-scale workloads.
Order management is the e-commerce process and system that tracks each order from placement through payment, fulfillment, delivery and returns.
Organic CTR is the share of search impressions that turn into clicks on unpaid results, a core SEO measurement metric for snippet…
Organic reach in social media marketing is the number of unique people who see a brand's content through unpaid distribution rather than…
Organic search is the unpaid part of search engine results, ranked by relevance and quality, and the traffic channel that SEO aims…
Organic traffic is the volume of website visits that arrive from unpaid search engine results, the core outcome tracked in SEO measurement.
An origin server is the authoritative server that holds the original content a CDN or proxy cache fetches, stores and delivers to…
An origin shield is a designated CDN cache layer between edge locations and the origin server that collapses cache misses and reduces…
The OSI model is a seven-layer reference model that divides network communication into functions, from physical signals up to application services.
OSPF (Open Shortest Path First) is a link-state interior routing protocol that computes shortest paths inside a network using areas and link…
An OTA update (over-the-air update) delivers new vehicle software wirelessly, changing features, fixes and security without a workshop visit.
Oversampling in video cameras means capturing more sensor pixels than the output resolution and downscaling them, for sharper, cleaner footage.