Alan Turing — "A computer is a universal machine, capable of carrying out any calculation that …"
A computer is a universal machine, capable of carrying out any calculation that can be performed by a human.
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More from Alan Turing
"I am not concerned with whether a machine has feelings, but whether it can perform tasks that require intelligence."
"We are not interested in the fact that a machine can solve a problem, but in the fact that it can solve a problem that we cannot."
"A machine does not have to be conscious to be intelligent."
"Unless in communicating with it one says exactly what one means, trouble is bound to result."
"We are not interested in the fact that a machine can do something, but in the fact that it can learn to do something."
Details
On Computable Numbers, with an Application to the Entscheidungsproblem
Date: 1936
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Understanding this quote
What it means
Machines aren't specialized tools locked to one task — they're general-purpose engines that can execute any step-by-step process a human can follow. Give a computer the right instructions and it replicates any calculation: arithmetic, logic, symbol manipulation, pattern recognition. This universality distinguishes a computer from a calculator or loom. The only limit is whether a process can be precisely defined as a finite sequence of steps.
Relevance to Alan Turing
Turing proved this mathematically in 1936 with his Universal Turing Machine — a theoretical device capable of simulating any other computing machine. At Bletchley Park he built Bombe machines that mechanized what human codebreakers did by hand, cracking Enigma at scale. His 1950 paper asked whether machines could think, extending universality from calculation to cognition. This conviction that machines could mirror human reasoning defined his entire career and his famous imitation game.
The era
In the 1930s–1950s, 'computer' meant a human worker performing arithmetic by hand — armies of people at desks calculating ballistic tables and census figures. Electronic machines like ENIAC and Colossus had just emerged. The idea that one machine could replace all those specialized human roles was revolutionary and contested. WWII had shown mechanical computation could break codes faster than any human team, making Turing's claim not just theory but demonstrated, war-winning fact.
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