Active reconnaissance is a type of computer attack in which an intruder engages with the targeted system to gather information about vulnerabilities.   

Active Record is the Model in MVC - which is the system responsible for representing business data and logic. It facilitates the use and creation of business objects whose data requires regular storage to a database.

A HTML page that includes one or more scripts that are processed on a Microsoft Web server before the page is sent to the user. 

A Microsoft program library (set of pre-packaged program routines) for use when creating Active Server Page (ASP) code and other ActiveX program components with C++ (including Visual C++). Formerly called ActiveX Template Library.

A set of object-oriented programming (OOP) technologies and tools that Microsoft developed for Internet Explorer to facilitate rich media playback. Internet Explorer uses ActiveX to load other software applications in the browser.

A component program object that can be re-used by application programs within a computer or among computers in a network. ActiveX controls can be downloaded as small programs or animations for Web pages.

Aerohive Certified Wireless Administrator (ACWA) by Aerohive

Alfresco Certified Workdesk Consultant (ACWC) by Alfresco

Aerohive Certified Wireless Professional (ACWP) by Aerohive

Ad Blockers allows users to prevent page elements, such as advertisements, from being displayed.

Ad networks help advertisers buy digital ads across a slew of publisher sites and apps.

An ad server is a computer server, specifically a web server backed by a database server, that stores advertisements used in online marketing and delivers them to website visitors. The purpose of ad serving is to deliver ads to users, to manage a websites advertising space and (in the case of advertiser ad servers) to provide an independent counting and tracking system for advertisers.

A Local Area Network (LAN) that is built spontaneously as devices connect. Instead of relying on a base station to coordinate the flow of messages to each node in the network, the individual network nodes forward packets to and from each other. 

A programming language similar to Pascal. It avoids error-prone notation, is relatively quick to implement, encourages reuse and team coordination, and is relatively easy for other programmers to read.

Adabas is an enterprise database management system designed and developed by Software AG for reliability, high performance, scalability and low total cost of ownership. Adabas makes it possible to store multiple data relationships in the same table, thus there are no data redundancies, such as found in relational database systems.

In a computer, an adapter is often built into a card that can be inserted into a slot on the computer's motherboard. The card adapts information that is exchanged between the computer's microprocessor and the devices that the card supports.