An inbound shipment.
"The warehouse manager is waiting to unload the new inbound shipment of electronics that arrived yesterday morning."
To pass a ball inbounds
"The player threw the basketball inbound from the sideline to restart play after the timeout."
Coming in, heading inwards
"The inbound flight from Tokyo landed smoothly at 6 PM."
In plain English: Inbound means something that is moving toward you, like an email arriving in your inbox.
"The inbound flight landed safely this morning."
The word inbound is formed by combining the prefix in with the past participle of bind. It originally meant being directed toward a destination or port from which one was arriving.