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Unsure I understand what you're asking.
If we're dealing with wired networks, then hosts have some kind of physical link connection to something. It doesn't have to be a switch, though. For example, a host might connect to a hub, which connects to a switch. Or, it might connect to a switch that doesn't support VLANs (or even has the host in a different VLAN from another switch's VLAN - i.e. host might be reachable on VLAN 5 on one switch but VLAN 10 on another [this is highly unusual and generally to be avoided].) Host might also trunk to a switch, and then the host has 'virtual' interfaces.
So there are cases where a physical switch port might have multiple hosts reachable via it, although more common is one host per physical switch port.
Unfortunately, the prior paragraphs might confuse you further, but again, it's unclear to me, what you're really asking.
Are you trying to understand the difference between a VLAN interface or SVI (switch virtual interface) vs. a physical port interface?
