Ionic bonding – The bond formed between two atoms by transfer of electrons.Example: Bonding in NaCl
Covalent bonding – The bond formed between two atoms by sharing of electrons. Example: Bonding in H2O
Polar Bonding :
polar bond is a covalent bond between two atoms where the electrons forming the bond are unequally distributed. This causes the molecule to have a slight electrical dipole moment where one end is slightly positive and the other is slightly negative.