If you're comparing it to physical bullying then:
Cyber bullying, though digital, can still have a lasting effect on a person's emotional state. Even if it is not face to face, the person will still feel the intended way of the bully.
Physically bullying includes fighting someone head on and can cause physical damage. While Cyber Bullying doesn't start off as physical, it can encourage others that are close to you to physically bully you.
Cyber bullying and physical bullying both are intended to make the other person feel bad most likely because they feel bad themselves.
Cyber bullying and physical bullying both typically don't have a genuine reason for it's occurrence.
Hope this helped! Sorry if I took the question the wrong way!