A：信息技術或資訊科技（英語：Information Technology，簡稱IT），是主要用於管理和處理資 訊所採用的各種技術總稱。它主要是應用電腦科學和通訊技術來設計、開發、安裝和實施資訊系統及應用軟體。它也常被稱為資訊和通訊技術（Information and Communications Technology, ICT）。
資訊科技的研究包括科學，技術，工程以及管理等學科，這些學科在資訊的管理，傳遞和處理中的應用，相關的軟體和裝置及其相互作用。
資訊科技的應用包括電腦硬體和軟體，網路和通訊技術，應用軟體開發工具等。電腦和網際網路的普及以來，人們日益普遍的使用電腦來生產、處理、交換和傳播各種形式的資訊（如書籍、商業檔案、報刊、唱片、電影、電視節目、語音、圖形、影像等）。
在企業，學校和其它組織中，資訊科技體系結構是一個為達成戰略標的而採用和發展資訊科技的綜合結構。它包括管理和技術的成分。其管理成分包括使命、職能與資訊需求、系統配置、和資訊流程；技術成分包括用於實作管理體系結構的資訊科技標準、規則等。由於電腦是資訊管理的中心，電腦部門通常被稱為「資訊科技部門」。有些公司稱這個部門為「資訊服務」（IS）或「管理資訊服務」（MIS）。另一些企業選擇外包資訊科技部門，以獲得更好的效益。
Information technology (IT) is "the study, design, development, implementation, support or management of computer-based information systems, particularly software applications and computer hardware", according to the Information Technology Association of America (ITAA).IT deals with the use of electronic computers and computer software to convert, store, protect, process, transmit, and securely retrieve information.
Today, the term information has ballooned to encompass many aspects of computing and technology, and the term has become very recognizable. IT professionals perform a variety of duties that range from installing applications to designing complex computer networks and information databases. A few of the duties that IT professionals perform may include data management, networking, engineering computer hardware, database and software design, as well as the management and administration of entire systems. Information technology is starting to spread farther than the conventional personal computer and network technology, and more into integrations of other technologies such as the use of cell phones, televisions, automobiles, and more, which is increasing the demand for such jobs.
When computer and communications technologies are combined, the result is information technology, or "infotech". Information technology is a general term that describes any technology that helps to produce, manipulate, store, communicate, and/or disseminate information.
In recent days ABET and the ACM have collaborated to form accreditation and curriculum standardsfor degrees in Information Technology as a distinct field of study separate from both Computer Science and Information Systems. SIGITEis the ACM working group for defining these standards. The Worldwide IT services revenue totalled $763 billion in 2009.
資料來源：WIKIPEDIA
