"Germanium is one of the few chemical elements in the Periodic Table, for which the theoretical prediction of its very existence has preceded its actual experimental discovery. This prediction was made by the Russian chemist Dmitri Mendeleev based on the general trends of valence and atomic weights within his Periodic Table of the chemical elements (1869) [D. Mendelejeff "Ueber die Beziehungen der Eigenschaften zu den Atomgewichten der Elemente", Z. Chem. 1869, 12, 405-406]. In an updated version of this Periodic Table (1871-1872) [D. Mendelejeff "Die Periodische GesetzmaÌ⁸ssigkeit der Chemischen Elemente", Ann. Chem. Pharm. 1872, Suppl. 8, 133-229; D. Mendelejeff "Zur Frage uÌ⁸ber das System der Elemente", Ber. Dtsch. Chem. Ges. 1871, 4, 348-352], Mendeleev proposed that there was a missing element in the carbon family with the atomic weight 72 that should be placed in the fourth row, just below silicon and just above tin within the carbon group. He named this non-existing (at that time) element as "eka-silicium". Following this seminal Mendeleev prediction, German chemist Clemens Winkler finally succeeded in 1886 in the isolation of "eka-silicium" from the mineral argyrodite (Ag8GeS6) and named this new element as germanium (Ge) [C. Winkler "Germanium, Ge, Ein Neues, Nichtmetallisches Element", Ber. Dtsch. Chem. Ges. 1886, 19, 210-211; C. Winkler "Mittheilungen uÌ⁸ber das Germanium", J. Prakt. Chem. 1886, 34, 177-229]. Winkler also pioneered the preparation of the first organic derivative of germanium, namely, tetraethylgermane Et4Ge, in 1887 [C. Winkler "Mittheilungen uÌ⁸ber das Germanium", J. Prakt. Chem. 1887, 36, 177-209]. Since then and up the present date, the chemistry of organogermanium compounds (that is, compounds featuring Ge-C bonds) has experienced an explosive growth, especially after the recognition of the key role of metallic germanium in semiconductor electronics in the mid-twentieth century, followed by the extensive use of germanium and its organic derivatives in optical fibers, polymerization catalysts, microchip manufacturing, and biomedical applications. Given the undoubted importance of organogermanium compounds, it comes as no surprise that the field of organogermanium chemistry is continuously growing thus requiring regular reviewing and updates on its latest advances. Among the most important previously published books on organogermanium chemistry, one should first of all mention excellent monograph by Satge̹ and co-workers [J. Satge̹, M. Lesbre, P. Mazerolles, "The Organic Compounds of Germanium, Wiley, 1971] and two comprehensive volumes of the Patai's series of books [(a) The Chemistry of Organic Germanium, Tin, and Lead Compounds (Eds. S. Patai, Z. Rappoport), Wiley, 1995; (b) The Chemistry of Organic Germanium, Tin, and Lead Compounds, Volume 2 (Ed. Z. Rappoport), Volume 2, Parts 1-2, Wiley, 2002]. Patai's latest book was published 20 years ago, and since then critical progress has been made in organogermanium chemistry with the majority of milestone developments achieved since 2000. That is why we have attempted in this book to survey, analyze and summarize the current state of affairs in the field of organogermanium chemistry, focusing on the latest (published mostly after 2000) groundbreaking advances with comprehensive and up-to-date literature coverage up to the end of 2021"-- Provided by publisher.