Information technology consulting (IT consulting, Computer consultancy, Computing consultancy, technology consulting or business and technology services) is a field that focuses on advising businesses on how best to use information technology to meet their business objectives. In addition to providing advice, IT consultancies often implement, deploy, and administer IT systems on businesses’ behalf.
The IT consulting involves a three-tier system:

Professional services firms which maintain large professional workforces and command high bill rates.
Staffing firms, which place technologists with businesses on a temporary basis, typically in response to employee absences, temporary skill shortages and technical projects.
Independent consultants, who function as employees of staffing firms or as independent contractors in their own right

Web development is a broad term for the work involved in developing a web site for the Internet (World Wide Web) or an intranet (a private network) . This can include web design, web content development, client liason, client-side/server-side scripting, web server and network security configuration, and e-commerce development. However, among web professionals, “web development” usually refers to the main non-design aspects of building web sites: writing markup and coding. Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, or social network services.
For larger businesses and organizations, web development teams can consist of hundreds of people (web developers). Smaller organizations may only require a single permanent or contracting webmaster, or secondary assignment to related job positions such as a graphic designer and/or Information systems technician. Web development may be a collaborative effort between departments rather than …

Computer Hardware Maintenance presents the full scope and understanding of how the PC hardware maintenance function should operate and be managed in an organization, including steps involved in containing costs, keeping records, and planning the integration of the help desk function. In today’s IS department too often the PC hardware maintenance function is treated as a ‘necessary evil’, with the understanding that eventually all equipment will have some degree of mechanical or electrical failure. This book discusses scenarios where keeping the maintenance function internal is most viable and where having it external, from a depot service, pickup and delivery, or on-site service, is most viable. Computer Hardware Maintenance concludes with brief descriptions of available third-party systems and how emerging trends in PC hardware configuration as proposed by the Desktop Management Task Force (DMTF) will have a major impact on the PC hardware maintenance function in the future.

Software development is the act of working to produce/create software. This software could be produced for a variety of purposes – the three most common purposes are to meet specific needs of a specific client/business, to meet a perceived need of some set of potential users (the case with commercial and open source software), or for personal use (e.g. a scientist may write software to automate a mundane task).
There are several different approaches to software development, much like the various views of political parties toward governing a country. Some take a more structured, engineering-based approach to developing business solutions, whereas others may take a more incremental approach, where software evolves as it is developed piece-by-piece. Most methodologies share some combination of the following stages of software development:
Market research
Gathering requirements for the proposed business solution
Analyzing the problem
Devising a plan or design for the software-based solution
Implementation (coding) of the software
Testing the software
Development
Maintenance …

A computer network allows sharing of resources and information among devices connected to the network. The Advanced Research Projects Agency (ARPA) funded the design of the Advanced Research Projects Agency Network (ARPANET) for the United States Department of Defense. It was the first operational computer network in the world. Development of the network began in 1969, based on designs developed during the 1960s.
Purpose

Facilitating communications. Using a network, people can communicate efficiently and easily via e-mail, instant messaging, chat rooms, telephony, video telephone calls, and videoconferencing.
Sharing hardware. In a networked environment, each computer on a network can access and use hardware on the network. Suppose several personal computers on a network each require the use of a laser printer. If the personal computers and a laser printer are connected to a network, each user can then access the laser printer on the network, as they need it.
Sharing files, data, and information. …

A video conference (also reffered as a videoteleconference) is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously.Videoconferencing uses telecommunications of audio and video to bring people at different sites together for a meeting. This can be as simple as a conversation between two people in private offices (point-to-point) or involve several sites (multi-point) with more than one person in large rooms at different sites. Besides the audio and visual transmission of meeting activities, videoconferencing can be used to share documents, computer-displayed information, and whiteboards.