Ionisation energy is the energy absorbed whereas electron affinity is the energy
released. Explain.

Explanation

When an electron is present in the outermost shell of an atom, it is bound by nuclear force
of attraction. In order to remove this electron, some amount of energy should e supplied to
overcome the nuclear force of attraction. During the addition of an electron to a neutral atom, the
electron approaches a neutral atom due to unclear force of attraction. This process involves work done towards the force of attraction and hence energy is released. Thus, ionisation potential is the energy absorbed and electron affinity is the energy released.