This plant is called a Diffenbachia and is one that I just added to my house plants yesterday.
The Diffenbachia is a plant that is considered to be delicate but is easily grown and maintained.
This plant requires high light areas, moist soil, temps above 50 degrees, and you only need to fertilize it every 2 to 4 months.
Diffenbachia is an oxygen generating plant, plus it purifies the air of any impurities. Plus this plant adds humidity to room air during dry conditions. So you pretty much have a very helpful plant on your hands when you have the diffenbachia.