Information technology

Information technology (or IT) is a term that encompasses all forms of technology used to create, store, exchange, and use information in its various forms (business data, voice conversations, still images, motion pictures, photos, multimedia presentations, and other forms, including those not yet conceived).[1]

Now, people have been using it to refer to other aspects of technology. It now covers many more fields of study than it has covered in the past.



Four basic periods Characterized by a principal technology used to solve the input, processing, output and communication problems of the time:

  1. Premechanical,
  2. Mechanical,
  3. Electromechanical, and
  4. Electronic

A. The Premechanical Age: 3000 B.C. – 1450 A.D.

  1. Writing and Alphabets—communication.
    1. First humans communicated only through speaking and picture drawings.
    2. 3000 B.C., the Sumerians in Mesopotamia (what is today southern Iraq) devised cuneiform
    3. Around 2000 B.C., Phoenicians created symbols
    4. The Greeks later adopted the Phoenician alphabet and added vowels; the Romans gave the letters Latin names to create the alphabet we use today.
  2. Paper and Pens—input technologies.
    1. Sumerians' input technology was a stylus that could scratch marks in wet clay.
    2. About 2600 B.C., the Egyptians write on the papyrus plant
    3. around 100 A.D., the Chinese made paper from rags, on which modern-day papermaking is based.
  3. Books and Libraries: Permanent Storage Devices.
    1. Religious leaders in Mesopotamia kept the earliest "books"
    2. The Egyptians kept scrolls
    3. Around 600 B.C., the Greeks began to fold sheets of papyrus vertically into leaves and bind them together.
  4. The First Numbering Systems.
    1. Egyptian system:
      • The numbers 1-9 as vertical lines, the number 10 as a U or circle, the number 100 as a coiled rope, and the number 1,000 as a lotus blossom.
    2. The first place value numbering systems similar to those in use today were invented between 100 and 200 A.D. in India who created a nine-digit numbering system.
    3. Around 875 A.D., the concept of zero was developed.
  1. The First Calculators: The Abacus. 

One of the very first information processors.

B. The Mechanical Age: 1450 – 1840

  1. The First Information Explosion.
    1. Johann Gutenberg (Mainz, Germany)
      • Invented the movable metal-type printing process in 1450.
    2. The development of book indexes and the widespread use of page numbers.
  2. The first general purpose "computers"
    • Actually people who held the job title "computer: one who works with numbers."
  3. Slide Rules, the Pascaline and Leibniz's Machine.

Early 1600s, William Oughtred, an English clergyman, invented the slide rule.

C. The Electromechanical Age: 1840 – 1940.

The discovery of ways to harness electricity was the key advance made during this period. Knowledge and information could now be converted into electrical impulses.

  1. The Beginnings of Telecommunication.
    1. Voltaic Battery.
      • Late 18th century.
    2. Telegraph.
      • Early 1800s.
    3. Morse Code.
      • Developed in 1835 by Samuel Morse
      • Dots and dashes.
    4. Telephone and Radio.
      • Alexander Graham Bell.
      • 1876
    5. Followed by the discovery that electrical waves travel through space and can produce an effect far from the point at which they originated.
    6. These two events led to the invention of the radio
      • Guglielmo Marconi
      • 1894

2. Electromechanical Computing

  1. Herman Hollerith and IBM.
    Herman Hollerith (1860–1929) in 1880.
  2. Mark 1

D. The Electronic Age: 1940 – Present.

  1. First Tries.
    • Early 1940s
    • Electronic vacuum tubes.
  2. Eckert and Mauchly.
    1. ENIAC, fixed, not stored, program

3. The First Stored-Program Computer(s)

    • John von Neumann's influential report in June 1945:
      • "The Report on the EDVAC"
    • British scientists used this report and outpaced the Americans.
      • Max Newman headed up the effort at Manchester University
        • Where the Manchester Mark I went into operation in June 1948--becoming the first stored-program computer.
      • Maurice Wilkes, a British scientist at Cambridge University, completed the EDSAC (Electronic Delay Storage Automatic Calculator) in 1949—two years before EDVAC was finished.
        • Thus, EDSAC became the first stored-program computer in general use (i.e., not a prototype).
  1. The First General-Purpose Computer for Commercial Use: Universal Automatic Computer (UNIVAC).

3. The Four Generations of Digital Computing.

The First Generation (1951–1958).

  1. Vacuum tubes as their main logic elements.
  2. Punch cards to input and externally store data.
  3. Rotating magnetic drums for internal storage of data and programs

The Second Generation (1959–1963).

  1. Vacuum tubes replaced by transistors as main logic element.
    • AT&T's Bell Laboratories, in the 1940s
    • Crystalline mineral materials called semiconductors could be used in the design of a device called a transistor
  2. Magnetic tape and disks began to replace punched cards as external storage devices.
  3. Magnetic cores (very small donut-shaped magnets that could be polarized in one of two directions to represent data) strung on wire within the computer became the primary internal storage technology.
    • High-level programming languages
      • e.g., FORTRAN and COBOL

The Third Generation (1964–1979).

Individual transistors were replaced by integrated circuits.

  1. The Fourth Generation (1979–Present).
    1. Large-scale and very large-scale integrated circuits (LSIs and VLSICs)
    2. Microprocessors that contained memory, logic, and control circuits (an entire CPU = Central Processing Unit) on a single chip.
      • Which allowed for home-use personal computers or PCs, like the Apple (II and Mac) and IBM PC.
        • Apple II released to public in 1977, by Steve Wozniak and Steve Jobs.
          • Initially sold for $1,195 (without a monitor); had 16k RAM.
        • First Apple Mac released in 1984.
        • IBM PC introduced in 1981.
          • Debuts with MS-DOS (Microsoft Disk Operating System)
      • Fourth generation language software products
        • e.g., VisiCalc, Lotus 1-2-3, dBase, Microsoft Word, and many others.
        • Graphical User Interfaces (GUI) for PCs arrive in early 1980s
          • MS Windows debuts in 1983.
            • Windows wouldn't take off until version 3 was released in 1990
          • Apple's GUI (on the first Mac) debuts in 1984.

Field of Study

This is in contrast to a Bachelor of Science in Information Technology which is a bachelor's degree typically conferred after a period of three to four years of an undergraduate course of study in Information Technology (IT). The degree itself is a Bachelor of Science with institutions conferring degrees in the fields of information technology and related fields.

Many employers require software developers or programmers to have a Bachelor of Science in Computer Science degree; however, those seeking to hire for positions such as network administrators or database managers would require a Bachelors of Science in Information Technology or an equivalent degree.[3] Graduates with an information technology background are able to perform technology tasks relating to the processing, storing, and communication of information between computers, mobile phones, and other electronic devices. Information technology as a field emphasizes the secure management of large amounts of diverse information and its accessibility via a wide variety of systems both local and world-wide.[4]

Related pages


  1. Rouse, Margaret. "IT (information technology)." September 2005.
  2. Butler, Jeremy G. "A History of Information Technology and Systems." Summer 1997.
  3. School of Computing Homepage. Retrieved on 2013-10-05.
  4. "Network and Computer Systems Administrators". Occupational Outlook Handbook. United States Bureau of Labor Statistics. 2012-03-29. Retrieved 2013-12-01.

Other websites

Categories: Computers

Information as of: 28.10.2020 10:16:28 CET

Source: Wikipedia (Authors [History])    License : CC-BY-SA-3.0

Changes: All pictures and most design elements which are related to those, were removed. Some Icons were replaced by FontAwesome-Icons. Some templates were removed (like “article needs expansion) or assigned (like “hatnotes”). CSS classes were either removed or harmonized.
Wikipedia specific links which do not lead to an article or category (like “Redlinks”, “links to the edit page”, “links to portals”) were removed. Every external link has an additional FontAwesome-Icon. Beside some small changes of design, media-container, maps, navigation-boxes, spoken versions and Geo-microformats were removed.

Please note: Because the given content is automatically taken from Wikipedia at the given point of time, a manual verification was and is not possible. Therefore does not guarantee the accuracy and actuality of the acquired content. If there is an Information which is wrong at the moment or has an inaccurate display please feel free to contact us: email.
See also: Legal Notice & Privacy policy.