Here's a nifty infographic explaining what A1C is. It's from onedrop, which runs an app that makes monitoring your diabetes easier. However, this one is useful not just for folks who are diabetic, but for everyone who encounters blood sugar - healthcare providers, family members, folks who have high or low blood sugar, and so on.
I may come back later and discuss this in more detail, but for now, let's just start with this. Enjoy!