Ranking w.r.t. installed number

Ranking w.r.t. installed number
PC’s
PDA’s
Workstations
Servers
Wearable (picture is provided)
Mainframes
Supercomputers
At the highest level, two things are required for computing
Hardware
Computer equipment such as a CPU, disk drives, CRT, or printer
Software
A computer program, which provides the instructions which enable the computer
hardware to work