The Z3 is widely considered to be the world's first functional, fully programmable, and automatic digital computer. It was designed and built by the German engineer Konrad Zuse, and it was completed in 1941. The Z3 was an electromechanical computer, which used over 2,000 relays for its logic and data storage.

The Z3 was a significant milestone in the history of computing, as it introduced several groundbreaking features that are fundamental to modern computers. Some key features of the Z3 include:

Binary arithmetic: The Z3 used a binary number system for representing and processing data, which is the foundation of modern digital computers. It used binary-coded decimal (BCD) representation for decimal numbers and binary representation for other data types.

Programmatic capability: The Z3 was the first computer to have the ability to store and execute a program. It used punched tape as the input medium for program and data storage, allowing users to create and run different programs on the same machine.

Floating-point arithmetic: The Z3 was capable of performing floating-point arithmetic, which allowed for calculations with real numbers that have varying degrees of precision.

Automatic operation: The Z3 was designed to automatically execute instructions without human intervention, making it a true automatic computer.

Despite its groundbreaking features, the Z3 was not widely used during its time due to limitations in its speed and reliability, as well as the challenging circumstances of World War II. Nevertheless, the Z3 laid the foundation for future developments in computing and paved the way for the modern digital computers that we use today.
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