What are port groups in VMware ESX?

Portgroup , this name we offen see in the ESX , these port groups can be referred as a various network hubs connecting to single virtual switch port. We all know each ESX server has its own virtual network. It has virtual switches on which the virtual machines are connected. But we do not see the portgroup outside the ESX. A single port group is always connected to the single vSwitch.
Port Groups are nothing but the VLANs or virtual local area networks which are defined by IEEE 802.1Q standards. These are configured to communicate within themselves as if they are on same LAN. For this communication we assign VLAN ID to the port group. All the members of the port groups share same VLAN ID also one member of the port group can see the packets sent by the other members of the port group. Port groups are identified by their names so they must be unique in the single ESX server.
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