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A desktop replacement computer (DTR) is a personal computer that provides the full capabilities of a desktop computer while remaining mobile They are often larger, bulkier laptops Some use a limited range of desktop components to provide better performance at the expense of battery life

The forerunners of the desktop replacement were the portable computers of the early-to-mid 1980s, such as the Osborne I, Kaypro II, the Compaq Portable the Commodore Executive 64 (SX-64) computers.

Modern desktop replacements generally perform better than traditional laptop-style computers as their size allows the inclusion of more powerful components. The larger body means more efficient heat- dissipation, allowing manufacturers to use components that would otherwise overheat during normal use.

A desktop replacement Acer 8920 laptop with an 18.4-inch screen which can replace a desktop with its big screen.