This introduction to Atomic and Molecular Physics explains how our present model of atoms and molecules has been developed during the last two centuries by many experimental discoveries and from the theoretical side by the introduction of quantum physics to the adequate description of micro-particles. It illustrates the wave model of particles by many examples and shows the limits of classical description. The interaction of electromagnetic radiation with atoms and molecules and its potential for spectroscopy is outlined in more detail and in particular lasers as modern spectroscopic tools are discussed more thoroughly. Many examples and problems with solutions should induce the reader to an intense active cooperation. TOC:Introduction.- Evolution of atom model.- Evolution of quantum physics.- Fundamentals of quantum mechanics.- The hydrogen atom.- Atoms with several electrons.- Emission and absorption of electromagnetic radiation.- Laser.- Molecules.- Experimental methods in atomic- and molecular physics.- Structure of condensed matter.- Dynamics of crystal lattice.- Electrons in condensed matter.- Semiconductors.- Dielectric and optical properties of condensed matter.- Amorphous solid state matter, liquids, liquid crystals and cluster.- Surfaces.