Formed by a shared pair of electrons between atoms.
It is a type of bond that takes place between two non-metallic atoms, it may be either polar covalent or non polar covalent, the bond is distinguished depending on the electronegativity value. if the value is less than 1.9 the bond is said to be polar covalent and if less than 0.4 it is said to be non polar covalent. some examples of polar covalent compounds are methane and ammonia, some examples of non polar covalent compounds are oxygen gas or o2 and fluorine gas or f2. it is also defined as the bond wherein atoms combine to attain stability