💻 The First 10 Computers in History 1️⃣ Zuse Z3 (1941, Germany) – First fully automatic, programmable computer. 2️⃣ Colossus (1943–44, UK) – First electronic computer, built for code-breaking in WWII. 3️⃣ Harvard Mark I (1944, USA) – Electromechanical, very reliable, used by the U.S. Navy. 4️⃣ ENIAC (1945, USA) – First general-purpose electronic computer, 18,000 vacuum tubes. 5️⃣ Manchester Baby (1948, UK) – First computer to store a program in memory. 6️⃣ EDSAC (1949, UK) – One of the first pr