The book "Fuzzy Group Theory" offers a comprehensive and up-to-date presentation of research on important topics in fuzzy group theory. It focuses on the theoretical aspects of fuzzy subgroups within a group and addresses their fundamental properties. The authors, John N. Mordeson, Kiran R. Bhutani, and A. Rosenfeld, discuss various types of fuzzy subgroups, including Hamiltonian, solvable, P-Hall, and nilpotent groups. Additionally, applications in abstract recognition and coding theory are covered. The book is a valuable reference for students and researchers engaged in fuzzy group theory and provides methods for deriving fuzzy theorems from crisp ones, as well as for embedding fuzzy subgroups into lattices of crisp groups.