Explain the terms mass defect and binding energy. How are they related ?

The difference in mass of a nucleus and its constituents is called mass defect. If a certain number of neutrons and protons are brought together to form a nucleus of a certain mass and charge, the energy released is called binding energy. \[\begin{aligned} \mathrm{E}_{\mathrm{b}} & =\Delta \mathrm{Mc}^{2} \\ & =\left\lfloor\left[Z m_{p}+(A-Z) m_{n}\right]-\mathrm{M}\right\rfloor \mathrm{c}^{2} \end{aligned} \]