Difference between recovery and e-recovery?

[pay.evolutionsantilli]

Sorry the question a little ' stupid, but I did not understand the difference between these two things because I noticed that when I start the phone in recovery mode known that that is the recovery, but if I connect the charger to the socket, press Power + Volume up, the phone starts I n e-recovery mode and allows me to download the stock ROM, I wanted to know even if you can edit or flash on this e-recovery thanks to all and those who will answer me.