Yay my favorite thread again!
But anyway yeah it's indica and sativa, but you've also got your ruderalis it's more like hemp than cannabis, but some people actually smoke the weird looking shit in such places as Russia.
Indica is that body buzz, couch-locking strain that gets you stoned and sativas tend to be more trippy and more of a mental buzz (e.g. better visuals), and although sometimes it's a stimulating high it's more often simply a less fatigued high.
So indica = generally fatigued, body high
sativa = much less fatigued, if at all, mental high
Like 5 threads exactly like this one have been posted in the last month, so I don't understand how you didn't get any search results on this.