1977: Personal computer
And here we are at the arrival of the first personal computer in 1977. Three were released—the Apple II, the Commodore PET, and the TRS-80 from Radio Shack. According to the Computer History Museum, the Apple II was sold between 1977 and 1993, giving it credit as one of the "longest-lived lines of personal computers." The site says millions were sold during that 16-year stretch. The Apple II was an all-in-one machine, packaged with a logic board, switching power supply, keyboard, case, game paddles, and a copy of the game Breakout. By contrast, the Commodore PET was discontinued in 1982, spending just five years on the market.
The Most Important Invention the Year You Were Born, Source:https://www.rd.com/list/most-important-invention-year-you-were-born/