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What is the difference between vitamin B complex and vitamin B compound?

I am trying to buy some good vitamin B's, But I am confused. I see complex and compound, but I dont understand the difference. Please elaborate.

Public Comments

1. Ones a complex and the other's a compound lol
2. use B-12
3. Vitamin B12 is also called cobalamin because it contains the metal cobalt. This vitamin helps maintain healthy nerve cells and red blood cells [1-4]. It is also needed to help make DNA, the genetic material in all cells [1-4]. Vitamin B12 is bound to the protein in food. Hydrochloric acid in the stomach releases B12 from proteins in foods during digestion. Once released, vitamin B12 combines with a substance called gastric intrinsic factor (IF). This complex can then be absorbed by the intestinal tract.