ARIA is a W3C specification of roles, states and properties that exposes the meaning of custom web interface elements to assistive technologies.
ARM64 is the 64-bit Arm instruction set architecture, formally AArch64, used in processors from smartphones and laptops to cloud servers.
ARP, the Address Resolution Protocol, maps an IPv4 address to the MAC address of a device on the same local network so…
ARR (annual recurring revenue) is the yearly value of a SaaS company's active subscription contracts, excluding one-time fees, used to measure scale…
An array is a data structure that stores elements of one type in contiguous memory, giving constant-time access to any element by…
Article schema is structured data that describes a news, blog or editorial page so search engines read its headline, dates, author and…
Artificial general intelligence (AGI) is a hypothetical AI system able to learn and perform most cognitive tasks at or above human level…
Artificial intelligence is the field of computer science that builds systems able to learn, reason and act on tasks that normally need…
An ASIC, or application-specific integrated circuit, is a chip designed for one particular task, trading flexibility for speed and power efficiency.
ASLR, address space layout randomization, places program code, libraries, stack and heap at random memory addresses to make exploits unreliable.
Aspect ratio in video is the proportional relationship between frame width and height, such as 16:9 or 2.39:1, which shapes composition and…
Asset tokenization is the process of representing ownership of a real or financial asset as a token on a blockchain, linked by…
Astrophotography is the photography technique of recording stars, planets, nebulae and the night sky using long exposures, stacking and accurate tracking.
Async/await in browser JavaScript is syntax for writing promise-based asynchronous code that reads like sequential code without blocking the page.
Asynchronous programming lets a program start long operations such as I/O and continue other work without blocking, resuming when each result is…
Asynchronous replication copies committed database changes to replicas after the primary confirms the commit, giving fast writes but risking some data loss.
An attack surface in cybersecurity is the sum of all points where an attacker can try to enter, extract data from or…
Attended automation is an RPA model in which software robots run on an employee's desktop and are started by that person to…
An attention mechanism lets a neural network weight the most relevant parts of its input for each output, and it is the…
An attribution model is the rule that assigns credit for a conversion to the ads, channels and touchpoints a customer encountered before…
ATX is the motherboard form factor standard that fixes board size, mounting holes, rear I/O position and power connectors for desktop PCs.
Audience retention measures how much of a video or stream viewers actually watch, shown as a percentage curve that reveals where attention…
An audio buffer is a block of digital audio samples held in memory between hardware and software, trading processing safety against latency.
Audio description is narration added to video that describes key visual information for blind and low-vision viewers during natural pauses in the…
An audio interface is the recording device that converts microphone and instrument signals into digital audio for a computer and plays the…
Audio mastering is the final production stage that balances, finishes and prepares a mixed recording for consistent playback and release on every…
An audit trail is a chronological, tamper-evident record of who or what performed each action in an automated system, when, on what…
auditd is the user-space daemon of the Linux audit framework that records kernel audit events such as system calls, file access and…
Authentication is the process of verifying that a user, device or service is who it claims to be before a system grants…
Authoritative DNS is the server role that holds the original records of a DNS zone and gives definitive answers about names in…
Authorization in cybersecurity is the decision whether an authenticated identity may perform a specific action on a specific resource under a policy.
Auto-update is a software mechanism that checks for, downloads and installs new versions automatically, keeping programs patched without user action.
Auto white balance (AWB) is the camera function that estimates the color of the light in a scene and corrects colors so…
Autofocus (AF) in photography is the camera system that measures focus error and drives the lens until the chosen subject is rendered…
Automation is the use of software or machines to run defined tasks and processes with little or no human effort, under rules…
Automation Anywhere is an enterprise RPA platform whose software bots, built and managed from a web Control Room, automate rule-based work across…
Automation governance is the set of policies, roles and controls that keep an organization's workflows, bots and integrations secure, compliant and owned.
An automation rule in home automation is a stored instruction that runs actions on smart devices when a trigger occurs and its…
An autonomous system is a network under one administrative routing policy, identified by an AS number and connected to the rest of…
Autoscaling automatically adds or removes cloud capacity as demand changes, so applications keep performance targets while paying only for needed resources.
AV1 is a royalty-free video codec from the Alliance for Open Media that compresses video more efficiently than H.264 and VP9 for…
Average order value (AOV) is total e-commerce revenue divided by the number of orders, showing how much a customer spends per completed…
Average position in SEO measurement is the mean ranking of a site's topmost result across all impressions, as reported in tools such…
AWS Lambda is the Amazon Web Services serverless compute service that runs code in response to events and bills only for actual…
Azure Functions is Microsoft's serverless compute service that runs event-triggered code with bindings, automatic scaling and several hosting plans.