The following figure may get a clear idea about which is the pin and which is the port.
A pin is a physical connection for a single net.
A port is a group of pins representing a standard interface.
In the physical world, a port is usually more than one pin
Nets are used for internal Interconnection
In VLSI physical design, ports and pins both serve as interfaces between the chip and the outside world, but they have distinct roles.
A port is a group of related signals grouped together for convenience. Ports typically represent the inputs and outputs of a specific module or block within the chip.
In contrast, a pin is a physical connection point on the chip where an external signal can be linked. Pins represent the actual physical connections to the chip, such as input/output pads or bonding pads.
In summary, ports organize logical signal groupings within the chip, while pins denote the physical connection points on the chip.