is sement and concreat the same thing?

Answer 1

concrete contains sand and gravel and stuff including cement and lime
Cement has less "stuff" added and is usually a smoother finish.
(I think I have that the right way around - been a while since I mixed any)

Answer 2

Concrete is a finish product that contains cement, sand, gravel, air and water.

Cement constitutes 7% to 15% of the absolute volume of concrete.

Cement (Portland Cement) is made of hydraulic calcium silicates, calcium aluminates, calcium aluminoferrites, and calcium sulfates mixed with water.

Answer 3

"Concrete is a construction material that consists, in its most common form, of Portland cement, construction aggregate (generally gravel and sand) and water."
This, and more, available on the free, online encyclopedia, Wikipedia at: http://en.wikipedia.org/wiki/Concrete

"In the most general sense of the word, cement is a binder, a substance which sets and hardens independently, and can bind other materials together."
This, and more, available on the free, online encyclopedia, Wikipedia at:http://en.wikipedia.org/wiki/Cement

Hope this helps!