Chain and FX loop

[Mahumadi]

Im trying to figure out the difference. A chain is the chain between all the pedals? An FX loop is looping FX? Im lost, can anyone help lol.

[bongomania]

A chain is just a string of devices all in a row. A --> B --> C --> D

A loop is where that chain extends from (and returns to) a central point, and the whole chain can be bypassed from that point.

-Chain on-
A --> B --> C --> D
-Chain off-

So like a loop is like a junction where the chain starts and finishes. It can be in your amp, or in a pedal.