What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Vitamin B, B1, B3, B6 and B12 Complex

Vitamins are the part of balanced diet and we need these nutrients as a part of our daily diet. There is a long list of vitamins like A, B, C, D, E etc. Among all these vitamins, vitamin B has many further subclasses and due to this reason, we know it as vitamin B complex.