What are the vitamins?

Vitamins are classified as organic components which are required by an organism in the form of nutrients. Vitamins are basically those types of organic components which cannot be synthesized by any living organism in sufficient quantities and must be obtained through diet only. There are different types of these vitamins required by different living organism. Like Vitamin D and K are only required by the humans while vitamin C is gained through ascorbic acid in few animals. This means that term is further conditional for the organism and their needs. This concludes this discussion in this way that they have to be taken either naturally or artificially through ones diet.