<p>This book covers aspects and achievements of the baryonic (star and gas) component of galaxy halos as presented at the successful conference &ldquo;On the Origin (and Evolution) of Baryonic Galaxy Halos&rdquo; held on the Galapagos Islands Ecuador March 13&ndash;17 2017. It can be regarded as a compendium of the prominent results in this field. The main focus is the latest simulations and observations of galaxy halos.&nbsp;</p><p>This compendium is recommended to researchers and advanced students as it contains peer-reviewed high quality papers that will meet their scientific needs and help to initiate new research directions. &nbsp;Everything described in this book is the result of a truly collective effort from the participants of the Galapagos conference.<br />&nbsp;</p>