The First Computer: ABACUS
(500 BC)
The abacus was created at around 500BC. It is said to be the first computer in history. The abacus was actually created in Greece. Abacus is still used in our everyday life.
Jacquard’s Mechanised Loom
(1801)
Around 1801, French man Joseph Jacquard created a kinetic loom through which strings needed to be pulled during every single step inside a style which was recorded inside a number of punch cards. The punch card encodes files having holes in unique spots.
Charles Babbage Counting Device
(1822)
Charles Babbage is well known for the creation of the difference engine (which also lead to the creation of computer). He is said to be the “Father of Computers”. 
Alan Turing
(1845)
Adam Turing is a mathmatician, logician and a computer scientist. He created the turing machine that lead to the creation of computers
First Generation: 1940-1956 (Vacuum Tubes) The first type of computer was the vacuum tube computer. It was gigantic, almost occupying an entire room.
Example: UNIVAC (earliest commercially used computer) and ENIAC
Second Generation:
1956-1963 (Transistors)
The second generation of computers used transistors, which were invented in 1947. Transistors were better than vacuum tubes but still generated lot of heat. They helped computers become smaller, faster, and more economical, but they still relied on punched cards and printouts. 
Third Generation: 1964-1971 (Integrated Circuits) Integrated circuits (IC) were the next major computer advancement. Semiconductors made of reduced transistors on silicon chips were introduced. The introduction of semiconductors significantly improved computers’ speed and productivity. The input and output devices were replaced with keyboards and monitors. An operating system was incorporated, which provided more functions for users.
Fourth Generation:
1971-Present (Microprocessors)
The introduction of microprocessors revolutionized the computer as it became much faster, more efficient and reliable, and less expensive. This allowed the amalgamation of numerous integrated circuits into a single small silicon chip or microprocessor.

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