History and Basic Concepts of Information Technology

Flashcards covering the history of IT, computer generations, basic hardware/software components, networking types, and computer ethics.

Information Technology (IT)

The use of computers, software, and telecommunications to store, process, and transmit information.

Information Age

The current era characterized by the rapid, widespread transformation and transmission of information through digital technology.

Electromechanical Age

The era ($1840-1940$) in which electrical and mechanical technologies combined to enable early information-processing devices like the telegraph and telephone.

Generation of Computers

A period in computing history characterized by a major shift in the underlying technology used to build computers, such as vacuum tubes or transistors.

Premechanical Age

The period ($c. 3000\,BCE-1450\,CE$) where people relied on manual tools like the abacus and early writing systems on papyrus and paper.

Mechanical Age

The period ($1450-1840$) featuring inventions like the printing press and mechanical calculators such as Pascal’s Pascaline and Leibniz’s Stepped Reckoner.

Electronic Age

The period from $1940$ to the present where components like vacuum tubes, transistors, and microprocessors transformed computing.

First Generation Computers

Computers produced between $1940-1956$ that used vacuum tubes and machine language; they were large, expensive, and generated excessive heat.

Second Generation Computers

Computers produced between $1956-1963$ that introduced transistors and high-level programming languages such as COBOL and FORTRAN.

Third Generation Computers

Computers produced between $1964-1971$ that utilized integrated circuits (ICs) to increase processing speed and reliability.

Fourth Generation Computers

The era from $1971$ to the present marked by the invention of the microprocessor and the rise of personal computers and the internet.

Fifth Generation Computers

The current and future era focusing on Artificial Intelligence (AI), machine learning, and natural language processing.

Computer

An electronic machine derived from the Latin "computus" and "computare" that can accept, manipulate, produce, and store data.

Input

Data that is entered into or received by a computer.

Process

The manipulation, calculation, or transformation of input data according to a set of instructions or a program.

Output

The result or outcome that comes from the transformation process of a computer.

Hardware

The collective term for the physical and tangible components of an analog or digital computer.

CPU

Central Processing Unit; the brain of the computer that processes and executes digital instructions.

RAM

Random Access Memory; a volatile and temporary memory storage that makes information immediately accessible to programs.

SSD

Solid-state drive; a non-volatile storage device based on NAND flash memory technology.

GPU

Graphics processing unit; a chip-based device that processes graphical data as an extension to the main CPU.

NIC

Network interface card; a circuit board or chip that enables a computer to connect to a network.

System Software

The set of programs that make a computer work, including memory management and input/output control, such as Operating Systems.

Utility Software

Programs designed to help manage and tune system or application software, such as Antivirus or Disk management tools.

Application Software

Software that performs specific tasks for the user, such as word processors, spreadsheets, or database management.

Liveware

The people interacting with the computer system, including System Analysts, System Programmers, and System Operators.

Procedures

A set of instructions written in code to instruct a computer on how to perform tasks or run software.

Data

Raw, unprocessed facts, numbers, text, or multimedia information that serves as input or output.

Connectivity

The element of a computer system where computers are linked to a network to facilitate sharing of information.

Internet

A specific interconnected network that connects computers worldwide using common standards like TCP/IP.

TCP/IP

A set of rules for computer communication; TCP breaks data into packets, while IP handles the communication between computers.

LAN

Local Area Network; a group of computers connected in a small area like a building or office.

PAN

Personal Area Network; a network interconnecting devices within an individual's immediate workspace, typically within a range of $10\,meters$.

MAN

Metropolitan Area Network; a network that covers a larger geographic area by interconnecting different LANs.

WAN

Wide Area Network; a network extending over large geographical areas like states or countries, such as the internet.

World Wide Web

Invented by Tim Berners Lee in $1991$, it refers to the interlinked HTML pages accessed over the internet.

URL

Uniform Resource Locator; a unique website address that users type into a browser to access a specific site.

Portal Website

A website that aggregates many functions such as email, news, and research data.

Ethics

A set of beliefs about right and wrong behavior in society.

Netiquette

The rules of conduct for respectful and appropriate communication on the internet.

Computer Ethics

A set of moral principles that regulate the use of computers.