What is photoelectric effect? How did Einstein explain it?

The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use _____ _______ ______ ________ ______ ______ _____ ___ __________ _______ ________ ________.
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