Hydrogen bond : A Hydrogen Bond is a bond between Hydrogen and other electronegative atom.as for example Hydrogen and  Oxygen  in water, Hydrogen  is  positive  ion and  Oxygen is negative ion. for containing  positive  ion and  negative ion in these atom attract each other and make bond . Hydrogen bond indicate  ...........

In Hydrogen bond  the H must be contain . Without H atom  no Hydrogen bond  is made.

kind of hydrogen bond: there are two kind of hydrogen bond.

1. Intermolecular hydrogen bond  and 

2. Intramolecular hydrogen bond

Intermolecular hydrogen bond is   a   bond  that occur  within  two atom in a  molecule as for example 2-hydroxy benzoic acid 


on the other  hand  ,  Intramolecular hydrogen is   a bond that  occur within separate  two molecule as for example  water molecule