Symmetries and the breaking of symmetries play an important role in particle physics. Several experts in the field give overviews of different symmetry aspects in subatomic physics. Topics like CP violation, chiral symmetry, supersymmetry and spontaneous symmetry breaking are addressed. The articles are the written accounts of lectures given at the 1998 Schladming Winter School and address in particular graduate students. The material is dealt with in a comprehensive and detailed manner and is at the same time pedagogically well devised.