  Chemical manifestations of strong light-matter coupling have been recently
subject of intense experimental and theoretical studies. Here we review the
present status of this field. Section 1 is an introduction to molecular
polaritonics and to collective response aspects of light-matter interactions.
Section 2 provides an overview of the key experimental observations of these
effects while Section 3 describe our current theoretical understanding of the
effect of strong light-matter coupling on chemical dynamics. A brief outline of
applications to energy conversion processes in given in Section 4. Pending
technical issues in the constructions of theoretical approach are briefly
described in Section 5. The summary in Section 6 also outlines the paths ahead
in this exciting endeavor.
