What is protein powder?

And were do you purchase this powder

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Answer:
Protein powders are made from four basic sources: whey (from milk), egg, soy and rice. Protein powders can also be a combination of one or more ingredients. These concentrated sources of protein are processed into the powdered form, to be reconstituted into liquid form as a protein shake, or mixed with fruit juice or milk. Additionally, protein powders can be sprinkled on cereal, stirred into soups or stews, and cooked into baked goods.

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Answer:
you can buy it at any local gyms, its just protein in powdered form, you usually mix it with water and drink it.

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Answer:
Protein powder is powdered protein. Get it from an online supplement store.