Please explain what is and why is vlan filtering needed in Mikrotik ??

Question

System administration

when to enable this feature and why

Answer 1

When you need to work with VLANs

Answer 2

This is done on the bridge into which many VLANs and regular interfaces are driven at once.
And depending on the rules of this filtering, VLANs will be sorted by interfaces in a certain way.

Answer 3

I'm afraid that the only correct answer to this question is -
Since you don't know what vlan is - you don't need it. or you need to thoroughly study the basics of the network,
do not use this option.
it is needed only when you need to divide the local network into several subnets.
Used in large organizations.
here you can delve into the basics of the network