Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. WAves in plasmas are an interconnected set of particles and fields which propagates in a periodically repeating fashion. A Plasma is a quasineutral, electrically conductive fluid. IN the simplest case, it is composed of electrons and a single species of positive ions, but it may also contain multiple ion species including negative ions as well as neutral particles. DUe to its electrical conductivity, a plasma couples to electric and magnetic fields. THis complex of particles and fields supports a wide variety of waves.