LN channels don't have to be closed when all funds are spent
So you know how you would have to refill you LN wallet with on chain bitcoins when you run out of bitcoins? Well not anymore :)
You can re-balance those via LN and keep your LN hot wallet open (almost) forever. This is a short animation how funds flow in LN.
Created by Irek Zielinski
If you don't know what the LN is-no worry!
FYI the LN is not banks: