There's several different types of pures. I'll list a few for you.
-1 defence pure(basic pure)
-20 defence pure(Initiate pure)
-30 defence pure(turmoil pure)
-40 defence pure(runepure)
-45 defence pure(zerker pure)
-70 defence pure(barrows pure)
-75 defence pure(dragon fire shield pure)
Typically any pure has quests corrosponding to it's defence level. For instance a initiate pure would have nature spirit and what lies below quests done. Any one of these pures can be unique depending on a number of things. A pure can be range, mage, or melee pures, defined by a high strength, range, or magic stat. A hybrid would have all these levels pretty high, making them good to use in all forms of combat ex: hybridding. Also pures can be furthered defined by their attack level. A pure with 50 attack would be called a "gmaul" pure. Here's how they can be characterized by attack
-1 attack(obby mauler)
-20 attack(corrupt pure)
-40 attack(f2p pure)
-45 attack(gravite 2h pure)
-50 attack(gmaul pure)
-60 attack(dds or claws pure)
-70 attack(whip or saradomin sword pure)
-75 attack(godsword pure)
-80 attack(chaotic pure)
You can define a pure by both of these things. For instance a 60 attack 40 defence account would be a dds/dclaws runepure. If you have anymore questions add my msn or pm me. Msn is
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Edit: A tank is an account with high defence and range. They may also have high magic.