Answer:
According to electronegetivity difference the type of bond is ionic bond because potassium (k+) has one valance electron in its outermost shell and chlorine(cl-) has 7 electrons in its outermost shell . so, potassium donates its one electron and chlorine receives the electron to have stable electronic configuration. as they have transfer of electron between them it is ionic bond.
as ionic bond is defined as the chemical bond formed by transfer of electrons between two elements.
hope it helps..