Hello, I'm trying to grasp the difference between ROT and ROL/ROR.

My understanding is ROT rotates the characters (A-Z, a-z) a certain number of characters left or right for obfuscation.

and

ROL rotates a certain number of bits left (or Right for ROR) for obfuscation. But isn't this the same thing? Where as if I change one bit in A = 01000001 to 01000010 I get B.

Or is ROT limited to (A-Z, a-z) where as ROL can use all values from 1 to 255 in the ASCII table?