The most obvious difference is that a PC does not move. If you put wheels or legs on a PC, then it is a robot. One very good definition of a robot that might illustrate the difference is in the link below.
what is the Difference between a Scara and an Articulated Robot
The snake is more aggressive.
Cartoon Network has been using Chicky Robot for Robot Chicken this season. They are the same.
A robot is a machine.
The difference is robots don't have brains.
one of them is robotic and the other is bionical
Nothing.
Pc
a robot is a fully metal machine that is programed to do something with a purpose. Robotic however has metallic properties.
what is difference between television and monitor.
a robot is only a machine and fractal is reconfigurable machine.
Starting a pc is when you press the power button and logging in is when you input the password.