History of computer science

The history of computer science traces the development of computation, algorithms, programming, and information theory, alongside the institutions and technologies that shaped them.

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Abacus: A counting device that represents numbers with movable beads or counters. Ancient counting tools show how practical calculation preceded formal computer science.
Turing machine: An abstract model of computation that manipulates symbols on an unbounded tape according to a finite set of rules. It formalized computation in a model that could describe what machines can calculate.
Alan Turing: A British mathematician who made foundational contributions to computability, mathematical logic, and wartime codebreaking. His work on computability helped define the theoretical foundations of computer science.
ARPANET: A United States packet-switching network, launched in 1969, that connected research institutions and preceded the Internet. It demonstrated networked computing among research centers and influenced the Internet’s development.
Mechanical calculator: A machine that performs arithmetic through mechanical components such as gears or levers. It performs calculation mechanically, unlike the programmable general-purpose machines that became central to computing.
Algorithms: Finite, precise procedures for solving problems or performing computations. The idea of stepwise procedures connects ancient mathematics to modern computation.
Church–Turing thesis: The thesis that every effectively calculable function can be computed by a Turing machine. It linked independent formal definitions of computation to a common account of algorithmic calculability.
Alonzo Church: An American mathematician and logician who developed the lambda calculus and work on computability. His formal account of computation developed independently alongside Turing’s.
Internet: A global system of interconnected computer networks that communicate using shared protocols. Computer science research in networking and protocols helped make this infrastructure possible.
Analog computer: A computer that represents quantities continuously and solves problems through physical or electrical relationships. Its continuous representation contrasts with the discrete digital systems that came to dominate.