Whats the difference?

I thought I had all the terms etc of mcns sorted until I struck this. I know that an insert is what you put inside a pocket nappy, but what is the difference between a booster and a doubler????

There's a lot of terminology which I'm sure is set out to confuse us poor Mums that already have terminal nappy brain (extension of preggy brain LOL). I think Nikki put up a post with all of the terminology and nappy options, it's on here somewhere!?!?

ETA: It's the "Nappy Systems" sticky post but doesn't have any info about the boosters/doublers yet

Edited by Two Blondinis