The document provides an overview of the history of computers from the early 1820s to modern times. It discusses how the first computer was invented in the 1820s but the first electronic digital computers were developed between 1940-1945 and filled entire rooms. Modern computers are much smaller, more powerful, and use integrated circuits. Personal computers became widely available in the 1970s and laptops in the 1990s. The internet further connected computers worldwide beginning in the 1960s.