Hardwood comes in two traditional "builds"

The first and by far the most desirable flooring is 

Solid 3/4 inch think

with several Pros vs Cons to consider, Cost is generally much higher, but is able to be refinished and has a much longer life expectancy.  However all wood products are easily damaged with water or  moisture, and temperature  swings.

Engineered Wood

is a layered and more stabilized product that is built like a plywood, designed to resist expansion and contraction,  in temperature swings.

The top layer is called a veneer and is generally 1-6 millimeters thick,  and can potentially be refinished as long as the veneer isn't punctured or sanded through.

Ususally slightly less cost the Solid hardwood   

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