What is Cess? Never heard that before.

And yes, as orangeman said, hydro is not a strain. It is a method used to grow cannabis as isn't anymore potent than soil grown cannabis.

Dro is used as slang though as good quality cannabis.

Anyways, there are so many strains out there that not any of them are the exact same. There thousands of different kinds that all have different looks, smells, tastes, and highs.

The only way to actually know what you're getting, is to buy from a medical club or right from a grower. 95% of dealers out there do not know what they are getting, and label their buds as whatever comes to their mind first.