Confused about the notion of VLAN

I'm confused about the VLAN. I thought that the notion of VLAN was this computer on different VLANS were not suppose to be able to communicate with each other. I am setting up a 6248 and for me to get DHCP to work, I need to enable ip Routing. When I turn the routing ip, all computers on different VLANS are able to ping each other. Is - it the way it was suppose to work, or am I missing something?
MGMT is on vlan 4093
DHCP is on VLAN 100 trunk e34 10.10.1.1
Host 1 is on VLAN 200 trunk e34 10.10.2.1
Host 2 is on VLAN 300 trunk e34 10.10.3.1
active IP routing

Tags: Dell Switches

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