what is meant by by covelant bond

 bonding is a proccess by which atoms of diffferent elements combine to form various types of molecules ...----:

there are two ways by which they combine :

1- giving or gaining electrons forming electrovalent bonds

2- sharing of electrons forming covalent bonds

eg- hydrogen atoms combine by sharing of electrons forming hydroogen molecule 

 hope this may help u .....!!! gud luck !!!!! :)   

It is a bond in which there is mutual sharing of electrons.

eg. CH4, HCl etc