Information technology

**Information technology** (or **IT**) is a word referring to all forms of technology used to create, store, exchange and use information in its various forms, such as data, voice, photos, business, conversations, still images, motion pictures, multimedia presentations.

## Overview
### Name
The modern word *Information Technology* was coined by Leavitt and Whisle. In 1958 a Harvard Business Review included, “The new technology does not yet have a single established name. We shall call it information technology.”

### Concept
Information technology is the concept that includes every process of information flow, such as data collection, processing, storage, search, transmission, and reception. In the information society, information technology is one of the most necessary industries. As technology advances day by day, IT has developed into an essential part. It is also attracting future industries.

In the future, the use of information technology will be more important in the overall industry. The development of the internet made it possible for the world to be connected. IT will be a power that makes an increasing number of promising occupations and science and technology.

### Contemporary usage
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.

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

# Premechanical
# Mechanical
# Electromechanical
# Electronic

### Premechanical Age: 3000 B.C. – 1450 A.D.
# **Writing and Alphabets—communication.**
## First humans communicated only through speaking and picture drawings.
## 3000 B.C., the Sumerians in Mesopotamia (what is today southern Iraq) devised **cuneiform**
## Around 2000 B.C., Phoenicians created symbols
## The Greeks later adopted the Phoenician alphabet and added vowels; the Romans gave the letters Latin names to create the alphabet we use today.
# **Paper and Pens—input technologies.**
## Sumerians' input technology was a stylus that could scratch marks in wet clay.
## About 2600 B.C., the Egyptians write on the papyrus plant
## around 100 A.D., the Chinese made paper from rags, on which modern-day papermaking is based.
# **Books and Libraries: Permanent Storage Devices.**
## Religious leaders in Mesopotamia kept the earliest "books"
## The Egyptians kept scrolls
## Around 600 B.C., the Greeks began to fold sheets of papyrus vertically into leaves and bind them together.
# **The First Numbering Systems.**
## 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.
## 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.
## Around 875 A.D., the concept of zero was developed.

# **The First Calculators: The Abacus.** 

One of the very first information processors.

### Mechanical Age: 1450 – 1840
# **The First Information Explosion.**
## Johann Gutenberg (Mainz, Germany)
##* Invented the movable metal-type printing process in 1450.
## The development of book indexes and the widespread use of page numbers.
# **The first general purpose "computers"**
#* Actually people who held the job title "computer: one who works with numbers."
# '''Slide Rules, the Pascaline and Leibniz's Machine.**
Early 1600s, William Oughtred, an English clergyman, invented the slide rule.

### 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.

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

2. **Electromechanical Computing**
# **Herman Hollerith and IBM.**Herman Hollerith (1860–1929) in 1880.
# **Mark 1**
* Howard Aiken, a Ph.D. student at Harvard University
* Built the Mark I
* Completed January 1942
* 8 feet tall, 51 feet long, 2 feet thick, weighed 5 tons, used about 750,000 parts

### Electronic Age: 1940 – Present.
# **First Tries.**
#* Early 1940s
#* Electronic vacuum tubes.
# **Eckert and Mauchly.**
## ENIAC, fixed, not stored, program
3. **The First *Stored-Program* Computer(s)**
* Early 1940s, Mauchly and Eckert began to design the **EDVAC - the Electronic Discreet Variable Computer'''.
#* 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).
# **The First General-Purpose Computer for *Commercial Use*: Universal Automatic Computer (UNIVAC).**
* Late 1940s, Eckert and Mauchly began the development of a computer called **UNIVAC (Universal Automatic Computer)**
* Remington Rand.
* First UNIVAC delivered to Census Bureau in 1951.
* **But*', a machine called LEO (Lyons Electronic Office) went into action a few months before UNIVAC and became the world's **first commercial computer**.
3. **The Four Generations of Digitalg Computing.**

**The First Generation (1951–1958).**
# Vacuum tubes as their main logic elements.
# Punch cards to input and *externally* store data.
# Rotating magnetic drums for *internal* storage of data and programs
#* Programs written in
#** Machine code
#** Assembly language
#** Compiler language
**The Second Generation (1959–1963).**
# 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**
# Magnetic tape and disks began to replace punched cards as external storage devices.
# 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**.
* Magnetic tape and disks *completely* replace punch cards as external storage devices.
* Magnetic core *internal* memories began to give way to a new form, metal oxide semiconductor (MOS) memory, which, like integrated circuits, used silicon-backed chips.
* **Operating systems**
* Advanced programming languages like BASIC developed.

# **The Fourth Generation (1979–Present).**
## Large-scale and very large-scale integrated circuits (LSIs and VLSICs)
## 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
##*** Apple's GUI (on the first Mac) debuts in 1984.
##*** **Microsoft Windows** debuts in 1985.
##**** Windows wouldn't take off until version 3 was released in 1990

## Field of Study
* A **Bachelor of Information Technology** (abbreviations **BIT**, **BInfTech**, **B.Tech(IT)** or **BE(IT)**) is an undergraduate academic degree that generally requires three to five years of study. While the degree has a major focus on computers and technology, it differs from a Computer Science degree in that students are also expected to study management and information science, and there are reduced requirements for mathematics. However, people pursue an MBA in IT, a 2-year degree, to attain managerial roles and advance their careers. 

A degree in computer science can be expected to concentrate on the scientific aspects of computing, while a degree in information technology can be expected to concentrate on the business and communication applications of computing. There is more emphasis on these two areas in the electronic commerce, e-business and business information technology undergraduate courses. Specific names for the degrees vary across countries, and even universities within countries.

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.

## Employment
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. 

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.

## Related pages
* Digital divide
* Systems theory
* Computer science
* Telecommunication
* Information systems

## References 
## Other websites 
* A History of Information Technology and Systems