Regarding size and form factors, servers come in three different shapes:
- Rack-mountable servers are designed to be installed in a frame called a rack (see Figure 1.9). These servers usually populate on-premises server rooms or data centers:

Figure 1.9: An HP server in a rack
- Blade servers are small modules known as blades that are installed on a server's chassis to save space and power. These servers usually populate data centers or supercomputer facilities.
- Tower servers are single big case servers that stand upright. These servers are usually either used for testing purposes or to provide ...