Alright kiddo, have you ever tried to guess what's inside of a present without peeking? That's kinda what ajñana is like.
Ajñana is a Sanskrit word that means "ignorance" or "not knowing". But it's not like you're just clueless about everything. It's more like you're missing some important information that's hiding from you.
In Buddhism, they talk about three types of ajñana. The first one is called "avidya" which means not knowing the true nature of things. It's like thinking a present contains a toy car, when really it's a stuffed animal. The second one is "asmita" which means identifying too much with yourself, like thinking you're the coolest kid in class when really you're just one of the gang. The third one is "raaga-dvesha", which means being controlled by your desires and aversions, like wanting candy all the time and hating broccoli, even though it's really good for you.
So basically, ajñana is like having a blindfold on and not being able to see things clearly. But don't worry, you can always remove that blindfold by gaining knowledge and wisdom about the world!