In information technology, hardware is the physical aspect of computers, telecommunications, and other devices such as cables, connectors, power supply units, and peripheral devices such as the keyboard, mouse, audio speakers, and printers.

A layer of programming that allows a computer operating system to interact with a hardware device at a general or abstract level rather than at a detailed hardware level. 

A differently in managed services and grid computing contexts. In managed services, HaaS is similar to licensing. In grid computing, HaaS is a pay-as-you-go model.

A hardware-based method of turning multiple servers into a cluster (a group of servers that acts like a single system). As a rule, a hardware cluster is created by installing a number of blade servers on the machine that will control the cluster.

A hardware description language (HDL) is a specialized computer language used to program the structure, design and operation of electronic circuits, and most commonly, digital logic circuits. It also allows for the compilation of an HDL program into a lower level specification of physical electronic components, such as the set of masks used to create an integrated circuit. A hardware description language looks much like a programming language such as C; it is a textual description consisting of expressions, statements and control structures. One important difference between most programming languages and HDLs is that HDLs explicitly include the notion of time. HDLs form an integral part of electronic design automation (EDA) systems, especially for complex circuits, such as microprocessors.

A.k.a. Layer 4-7 router, is a physical unit that directs computers to individual servers in a network, based on factors such as server processor utilization, the number of connections to a server, or the overall server performance.

A hardware security module (HSM) is a physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing. These modules traditionally come in the form of a plug-in card or an external device that attaches directly to a computer or network server.

Hardware virtualization is when the virtual machine manager is embedded in the circuits of a hardware component instead of being called up from a third-party software application. 

The device, which contains a dedicated processor, manages authentication, encryption, and other VPN functions, and provides a hardware firewall. Hardware VPNs provide enhanced security for the enterprise.

The code name for version 8.04 LTS Server Edition of Ubuntu, the open source Debian-based Linux distribution. It is widely recognized as one of the most easy-to-use desktop Linux distributions for novice users. 

A message authentication code that uses a cryptographic key in conjunction with a hash function.   

The transformation of a string of characters into a usually shorter fixed-length value or key that represents the original string. Hashing is used to index and retrieve items in a database as it is faster to find the item using the hashed key.

A tag used to categorize posts on Twitter (tweets) according to topics. It is done by prefacing the relevant term with the hash symbol (#). That will allow people who follow that topic to find your tweet and perhaps follow you as well. 

Haskell is a standardized, general-purpose purely functional programming language, with non-strict semantics and strong static typing.

IBM Certified Application Developer - Rational Host Access Transformation Services (HATS) v7.1 by IBM

Hitachi Data Systems Certified Expert (HCE) Replication Solutions Architect by Hitachi Data Systems