Charles Muller, AbiWord, ABNT NBR 15606, Abstract Syntax Notation One, ABViewer, ACARM-ng, Accelerator (Internet Explorer), Accelerator (software), Accessibility, Accessible publishing, Accounts payable, ACCU (organisation), ACDSee, Acid3, ACORD, Acronym, ActionScript, Active Agenda, Active Scripting, ActivePerl, Adam Bosworth, Adapter pattern, Adaptive Server Enterprise, Add-on (Mozilla), Additive Manufacturing File Format, Adeptia, Adobe Animate, Adobe Audition, Adobe Captivate, Adobe ColdFusion, Adobe Dreamweaver, Adobe Flash Lite, Adobe Flash Media Server, Adobe Flash Player, Adobe FrameMaker, Adobe GoLive, Adobe InDesign, Adobe LiveCycle, Adobe LiveCycle Designer, Adobe Muse, Adobe RoboHelp, AdsML, Advanced Authoring Format, Advanced Content, Advanced Stream Redirector, AecXML, AES31, AEX cfiXML, AgcXML, Agile Automation.
In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.