What's ment by saying that the sharing of electrons betwen atoms falls on a continum from covalent &ionic bond

atoms have a certain amount of electronegativity or "pull" on electrons.....when they "pull" harder, it makes the charges more definite......as atoms bond to make molecules, they can exchange or share electrons to fill up their outer energy shell.....however, it really may fall somewhere between sharing and exchanging....maybe a little of both, that is where the continuum part comes in. Covalent is sharing (co means between/together, like coworker) ionic is exchanging electrons