Question

what is the difference between electron affinity ionization energy

Answer 1

the 2 are almost reverse processes:

IE is taking an electron away from an atom

EA is adding an electron from an atom

Answer 2

Ionization energy is the amount of energy needed to remove an electron from a neutral atom. Electron affinity is the amount of energy released when electron is added to an atom.
Ionization energy is related with making cations from neutral atoms and electron affinity is related with making anions .
for more reading http://www.differencebetween.com/difference-between-ionization-energy-and-vs-electron-affinity/