# Difference Between Betaine & Zwitterion?

what is difference btw Betaine & Zwitterion, Both having positive and negative charge in a molecule.

How to categorize Zwitterion and Betaine? or both are same.

From Wikipedia:

A betaine (BEET-ah-een, /ˈbiːtɑːˌiːn/) in chemistry is any neutral chemical compound with a positively charged cationic functional group [...] which bears no hydrogen atom [...]. A betaine thus may be a specific type of zwitterion.

• it mean Betaine is a class of Zwitterion, But why it called Betaine? Also, there is hydrogen atom in Betaine in a given formula, – Khan Sep 8 '16 at 13:33
• @N.ALodhi The cation in the given betaine is bonded to three $\ce{Ph}$ (phenyl) groups, which means no hydrogen atom. – DHMO Sep 8 '16 at 16:18