Durability of hard andonised metal (aluminum)
Anodizing is a surface treatment that thickens the natural oxide layer of a piece of metal.  Aluminum is the most commonly used metal that is anodized, but magnezium, zinc, and some other metals can also be anodized.  Steel can not be effectively anodized.  

So any description of pots and pans that uses "anodized" is almost certainly referring to aluminum.  

It doesn't change the strength of the metal, only the surface properties - corrosion resistance, colour, etc.

Hard anodizing creates a thicker layer of oxide than "normal" anodizing, but it's still a surface treatment, it doesn't change the strength of the metal.