The theory of electromagnetic beams is presented in a simple and physical way, with all necessary mathematics explained in
the text. The topics covered are in free-space classical electrodynamics, but contact is made with quantum theory in proofs
that causal beams of various kinds can be viewed as superpositions of photons. This follows from explicit expressions for
the energy, momentum and angular momentum per unit length for each type of beam. The properties of beams in the focal region,
of special experimental and theoretical interest, are discussed in detail.There are eight chapters: on Fundamentals, Beam-like
solutions of the Helmholtz equation, Electromagnetic beams, Polarization, Chirality, Comparison of electromagnetic beams,
a chapter on Sound beams and particle beams (to show the similarities to and differences from the vector electromagnetic beams),
and a final chapter on Measures of focal extent. Ten Appendices cover mathematical or associated physical topics.