Hello, I've been reading a lot about PCIe online, and sometimes it's referred to as a bus and sometimes as an interface. Unfortunately, I'm not quite sure if they're the same thing or what the difference is. Can someone help me? Thanks in advance!
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Bus and interface is the same.
One could at most distinguish the two in that the interface of the physical connection and the bus is the communication protocol behind it.
https://forum.allaboutcircuits.com/threads/difference-between-a-bus-and-an-interface.126626/
To German: A bus is what transmits the signals between two participants. An interface/interface is the connection from one device to the bus or the protocol of this connection.