Simplify the following text for a Grade 3 native English-speaking person.
Original: The triangle denotes the operation that simply copies the input to the output ; the small circle on the output denotes the actual inversion complementing the input . The convention of putting such a circle on any port means that the signal passing through this port is complemented on the way through , whether it is an input or output port .
Simplified: It means the output is not the input .