A computer is a mechanism or equipment that follows instructions from a software or hardware programme to perform procedures, calculations, and operations. Key Points The Desktop computer is a personal computer designed for regular use at a single location with a connected power source. Some advantages and disadvantages of Desktop computers are mentioned below: Because of the huge keyboard, typing on a desktop computer is simple. Because the computer has a large amount of disc space, it can store a lot of data. Desktop PCs are quite dependable. It is simple to start an internet business and rely on technology. Because it takes up so much space, moving a desktop computer from one location is challenging. A laptop computer or notebook computer is a tiny, portable computer featuring a screen and an alphanumeric keypad. Some advantage and disadvantage of Laptop computers are listed below: A laptop comprises a display, keyboard, touchpad (which substitutes the mouse), and speakers built-in. Laptop computers are rarely supplied with a mouse Due to their small size, laptops are particularly portable. Most modern laptop computers have built-in webcams. In comparison to regular computers laptops are more easily damaged. A very important point is that laptops really do not like reinstalling the operating system. Therefore, A, B and D is the correct statement. Additional Information The Olivetti Programma 101 was the first computer that could be considered a desktop. It was a typewriter-sized device that was released in 1965. The 16-bit Dulmont Magnum, designed by David Irwin and John Blair of Dulmison, Australia, in 1982 and delivered in Australia by Dulmont in September 1983, was the first true laptop.