Rewards token are those which you only need to hold on your wallet and receive dividends just by holding.
there's tax when you buy the token and part of that tax get distributed to the holders.
examples are:
$EGC which you receive BUSD as dividends
$SFM which you receive SFM as dividends
$ALTS which you receive any BSC token of your choose as dividends
Tax was a crazy idea basically only a transaction and you will be getting a huge charge to pay big tax. This idea totally a non sense idea. The project developers are not a regulators that were doing taxation. It's better for you to avoid this kind of token. This token was actually BS. They are only thinking if they can distribute dividend through the tax but basically that's investor's money that got trapped into that cycle.
The developers are so lazy as fuck just to think the easiest way for them to make the project looks so attractive by doing nothing.
Tax in transaction was not a real income from their product and that's BS