The term "computer" originally referred to human individuals who performed calculations, especially before the 20th century. With the advent of the electronic era, "computer" has come to describe a programmable machine capable of executing a wide range of tasks, from simple calculations to complex simulations. The journey began with mechanical prototypes, evolving into the groundbreaking ENIAC in the mid-20th century and eventually leading to the microprocessor revolution that brought powerful personal computers to homes worldwide. Today's computers are omnipresent, deeply integrated into daily life, driving innovations in fields like artificial intelligence, data science, and global communications. Through continuous advancements, computers remain at the forefront of technological progress, reshaping industries and society.