A Bit of History and Context.- Penning Trap Concept and Implementation.- Hyperbolic and Cylindrical Penning Traps.- Variations on the Penning Trap Concept.- Motion of a Single Particle in an Idealised Trap.- Motion of a Single Particle in a Real Penning Trap.- Inherent Effects of Single-Particle Confinement.- Particle Ensembles in Penning Traps.- Loading a Trap with Particles.- Excitation of Particle Motions.- Resonant Motional Coupling.- Motional...