There are several different types of indian defenses, none of which are at all similar. The one that mounts a kingside attack is called the King's Indian defense.
You are kind of being vague lol. You should wait for somebody more experienced to answer your questions... (other indian openings include the nimzo-indian, which is extremely good, bogo-indian, which is meh, queen's indian, which is ok, and then there's the gruenfelds that i'm pretty sure are in a class of their own)
Well, lately as Black, i've been responding to d4 with nf6, c4 g6 etc. I've used this system, which i believe is the indian defense, because black gets a safe king, and doesn't really give white much to bite on right away. Also, developement feels natural here. I must admit, i really don't know how this system functions after 0-0 and d6(which i guess could also be d5((grunfeld?)) played by black. I've looked up the system and there are a ton of variations, in some ways, just like the sicilian. Are Black's plans in these systems similar, or are they very different? Each time i've tried this defense, i seem to do ok. It feels like black is intentionally letting white build up, but i'm not sure if that's the case. A friend of mine told me that, eventually, Black mounts an attack on the king side. I'm sure i'll stick with the defense, and i'm sure i sound a little silly here saying "i play this thing because i like the way it feels and that's it" but i'm hoping some people experienced in these lines can at least come forward and give me a little bit more info. Hopefully i'm not sounding vague. Thanks again.