The book "High-Redshift Galaxies" offers a comprehensive introduction to a significant research field in astrophysics that focuses on high-redshift galaxies. These galaxies have increasingly come into the spotlight of the scientific community over the past few decades, particularly since the introduction of the Lyman-break technique, which allows for the identification of significant samples of these objects. With advancements in telescope technology, especially the 8- to 10-meter telescopes, the first high-quality spectroscopic data have been obtained. The book aims to consolidate and evaluate the wealth of available data to provide access to this dynamic and rapidly evolving area of astronomy for both new researchers and interested readers. It offers a valuable summary of previous findings and highlights the relevance of high-redshift galaxies in current astrophysical research.