Notebook or Laptops
Laptops are capable of the same tasks as a desktop PC, although they are typically less powerful. Components are similar to their desktop counterparts, but are miniaturized for mobile use.
Barebone computer
Is a half-assembled platform that consists of a case with a power supply, a motherboard preinstalled into the system case, and a cooling system. The purchaser of such a platform only has to equip it with a CPU, RAM, hard drive and additional input/output devices depending on his/her own needs.
Desktop computer
Currently the most affordable computers and common in businesses, schools, and households; they are used for performing office tasks, organizing digital photos, video editing, and Internet access. Desktop computers come in a variety of case styles ranging from large vertical towers to small forms that can be tucked behind an LCD/Tft monitor.
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Full Systems
These are computers that are fully inclusive of the keyboard, mouse, cpu, monitor and sometimes speakers. All ready to go, just conect the cables together and thats it.