Simply Electropositivity is the measure of the ability of elements (mainly metals) to donate electrons to form positive ions. The elements that can easily accept electrons to form negative ions are called electronegative elements, for example: non-metals.
A chemical bond is formed between 2 elements either by loss/gain of electrons (ionic bond) or by sharing of electrons (covalent bond). Electronegativity is the property by which an element attracts the shared electron cloud pair towards itself and this results in a partial negative charge on the electronegative element. The other element gains a partial positive charge and is said to be electropositive