Different terms for the same or more secure?

["Hylton Conacher(ZR1HPC)" <hylton () conacher co za>]

Hi all,

Seen a bit of traffic about vlans and as a junior networking person, I 
am wondering if they could be equal to physical subnets in the TCP/IP 
protocol.

What further confuses me is that I read on Google that vlans can also 
have subnets.

Could someone define each for me and the list and also why one is more 
secure than the other.

Tnx
Hylton


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