Whats the difference between rebonding, thermal straightening..?

I keep coming across different names of procedures for hair straightening like:

Japanese straightening, Thermal straightening, Chemical straightening, Permanent hair straightening,Rebonding

Are they different names for the same thing...if not, whats the diff?and which one is the safest /least damaging ?

Whats the difference between rebonding, thermal straightening..?

They are different names for the same thing