What is the difference between a VLAN and a subnet?

Problem

I have read numerous forums and articles regarding VLANs and subnets. However, I haven't understood the functions of each apart from the following: Subnets allow the segmentation of a network VLANs are an isolated portion of a network Questions If I have multiple subnets I assume that you would need a router to communicate between each subnet. Only devices within each subnet would be in the local broadcast domain for that subnet. Is that right? Do I need a subnet to setup a VLAN? I am aware that a VLAN can exist within a subnet. But my understanding is that you would have to assign an IP address of that subnet to the VLAN. How can it be isolated from the rest of the subnet? When would you set up a VLAN? Especially if I am able to segment my network using subnets? I keep coming across the following point. However, I am unsure what this exactly means when it reads . Virtual local area networks (VLANs) allow us to create different logical and physical networks; whereas IP subnetting simp…