as for the people who doesnt know yet about chemical bonding,ionic bond is the transfer of electrons from metal to non metal elements while the covalent bonding is the  sharing of electrons between nonmetals.the covalent has two types;the polar which is the  unequal sharing of electrons and the nonpolar with  equal sharing of electrons.
 it is important for us to know its significance, with the help of that we can determine the bond formed in a substance we usually have.some substances contains elements or compounds that forms a bond.