Electromagnetic Trap Properties.- Summary of Trap Properties.- Mass Spectrometry.- Mass Spectrometry Using Paul Traps.- Mass Spectroscopy in Penning Trap.- Spectroscopy with Trapped Charged Particles.- Microwave Spectroscopy.- Optical Spectroscopy.- Lifetime Studies in Traps.- Quantum Topics.- Quantum Effects in Charged Particle Traps.- Quantum Computing with Trapped Charged Particles.