To understand chemical bond let us consider two ions first one is a cation and cation is a positively charged ion and the second one is in anion and anions are negatively charged ions. now you must be thinking that what will happen between this cation and anion then between this cation and anion there will be some force of attraction is cations are positively charged and as anions and negatively charged  this force of attraction is holding the two ions cations and anions  together and to form something called as a compound then this force of attraction which holds the ions together to form a compound is called as a chemical bond let us consider two atoms atom one and atoms two ,even between this atom there will be some attraction called us force of attraction which is going to hold the Atom  together in the molecule this force of attraction which holds the atom together in the molecule is called as a chemical bond so i can finally define chemical bond as the force of attraction which holds atoms or ions together in a molecule is called as the chemical bond.