And & operation: AND, A and B are both 1 (high level), output 1. In other cases, output 0. All 1 out 1, 0 out 0
Or operation: OR, A and B are both 0 (high level), output 0, otherwise output 1, 1 out of 1, all 0 out of 0
Not operation: NOT, the input content is inverted and then output (the small circle at the output terminal represents the inversion)
Exclusive OR circuit XOR^: A and B output 0 when the input is the same, and output 1 when they are not.
