I have a question regarding entries we make in route tables.

Destination  Target
0.0.0.0/0   igw-id

What I understand is that to reach ‘destination’, it would be done via ‘target’.

So in this case, to reach public internet(0.0.0.0/0), it would be done via internet gateway.

But this is just outgoing traffic. Why dont we have similar entry for incoming traffic mentioning internet gateway, as all incoming traffic with public internet has to happen via internet gatway only?