Defining VLAN

Question on the definition of a VLAN.

Any collision domain I define with a layer2 switched port, whether I have a hub or single workstation plugged into the port, becomes a VLAN. Is this correct? To go a step further, on some layer2 switches I could configure 2 ports as a single collision domain – and thus a VLAN. Is this correct?

Does this mean that by definition, when I replace the hubs in the wiring closet with layer 2 switches, each of my workstations/devices will have their own VLAN?

Thank you in advance for answering.

Gary Goerke