There are many choices in the computer market with different models and designs all created for different benefits and uses. Computer manufacturers design systems made for all possible uses with a variety of features to perform any type of computing task. There are also different models and designs available and a whole mobile sector that makes it easy to compute from anywhere without being tied to a plug.
As far as desktop systems go there are two main designs, the all-in-one and the traditional desktop computer system. Each has its own benefits and pros and cons. The choice sometimes comes down to how and for what the computer will be primarily used.
The all-in-one model is where the monitor and CPU are part of one unit so you do not have a CPU tower and a separate monitor that takes up more space as is the case with the traditional desktop system. The all-in-one eliminates the bulky and messy cables and connection wires that are part of the traditional set up.