The Z3 was the world's first working programmable, fully automatic digital computer, completed in 1941. It was designed by Konrad Zuse in 1938 and built in Berlin, Germany. It supersedes the Z1 and Z2, which were completed in 1938 and 1940 respectively, but unreliable in operation.

The Z3 had 2,600 relays, a 22-bit word length and a clock frequency of about 5–10 Hz. A single addition took about 0.8 seconds, and a single multiplication took ~3 seconds. For reference, most modern-day computers run at >3GHz, and can perform billions of computations every second.  The Z3's Program code was stored on punched film, and initial values were entered manually. It is Turing-complete and has loops, but does not have conditional branching.

The Z3 wasn't actually used very much. One of the few programs written was a "Program to Compute a Complex Matrix" built to solve wing flutter problems. When Zuse asked the German government for funding to replace the relays with fully electronic switches, it was denied for being "not war-important" as World War II was ongoing, and the original was destroyed on 21 December 1943 during an Allied bombardment of Berlin. The Z3 was re-created in 1961 and that recreation still exists at Deutsches Museum in Munich today, and another modern reconstruction was built from 1997-2003 and was presented in 2010 at the Konrad Zuse Museum in Hünfeld.

While the Z3 was certainly a milestone, it would take until about the 1980s before personal computers became the norm, and until the 2000s/2010s before the Internet and social media really exploded and became what we know today.

See more: https://en.wikipedia.org/wiki/Z3_(computer)
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