ECS network.direction field

Hi All,
Can anybody help me in understanding the meaning of network.direction field in ECS ?
I went through https://www.elastic.co/guide/en/ecs/current/ecs-network.html

Please help me with an example to understand the meaning of :
1.) external
2.) internal
3.) inbound
4.) outbound
5.) unknown

Thanks

Any help on this ?

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