- Designed in the early 19th century
- Capable of performing basic arithmetic operations
- Considered one of the first mechanical computers
Ada Lovelace
- Daughter of Lord Byron
- Considered the world's first computer programmer
- Wrote an algorithm for the Difference Engine
Herman Hollerith's Tabulating Machine
- Invented in the late 19th century
- Used for processing statistical data
- Based on punched cards
Alan Turing's Enigma Codebreaking Machine
- Developed during World War II
- Used to decipher coded messages sent by the German military
- Considered a precursor to modern computers
John Atanasoff and Clifford Berry's ABC Computer
- Developed in the early 1940s
- Used electronic vacuum tubes instead of mechanical components
- Considered the first electronic digital computer
ENIAC (Electronic Numerical Integrator and Computer)
- Developed at the University of Pennsylvania in the mid-1940s
- Used for performing complex mathematical calculations
- Considered one of the first general-purpose computers