Is there an article someone could point to that explains how kbin, lemmy.ml, lemmy.world etc. all relate to one another?

Is there an article someone could point to that explains how kbin, lemmy.ml, lemmy.world etc. all relate to one another?

For example do I need an account with both kbin and lemmy, or are they just different names for the same thing?

Can I subscribe to a lemmy.world ‘channel’ with my kbin account?

Still trying to work things out.

#RedditMigration