Incoming and Outgoing router traffic

Hi everybody,
What exactly is the concept of incoming and outgoing traffic at one particular router interface? Can outgoing traffic be considered as the traffic forwarded from that interface to another interface?
Cheers
Aditya Naidu

imagine an interface has two doors.
|| interface ||
thus packet flowing towards the interface would be considered "in",
--> || interface || <--
alternatively, packet flowing the opposite direction would be considered "out",
<-- || interface || -->
now, let have a look at the router with 2 interfaces.
|| interface 1 || -- routing process -- || interface 2 ||
packet originated from subnet connected to interface 1 destined for the subnet connected to interface 2:
--> || interface 1 || --> --> || interface 2 || -->
in other words,
the packet firstly flows "in" interface 1, "out" interface 1, "in" interface 2, and finally "out" interface 2.

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