  Wolf-Rayet (WR) stars are massive ($\geq$10 M$_{\odot}$) evolved stars
undergoing advanced nuclear burning in their cores, rapidly approaching the end
of their lives as supernovae. Their powerful winds enrich the interstellar
medium with heavy elements, providing raw material for future generations of
stars. We briefly summarize high-energy processes in WR stars, focusing mainly
on their X-ray emission. We present new results from Chandra observations of
the eclipsing WR+O binary CQ Cep covering a full orbit which stringently test
X-ray emission models.
