What is the difference between physical and logical topology?

Physical topology are says how the wire are interconnected, while Logical topology is how the network behaves and inter-operates.

Logical typologies tend to focus on traffic flows, routing domains, router peering, control points, IP addressing schemes, network segmentation, administrative domains to name a few. This can also show things like wired vs wireless, where firewalls sit, load balance's, etc.

 They do not focus on port names, port counts, what cables connect to where, what specific models are used, etc.

They are just different ways of representing a network architecture. Physical topologies are how the wires are interconnected, while logical topology is how the network behaves and interoperates