This book is intended to serve not only the needs of the beginners but also of those who are working on ideal topological spaces. As an elementary text it begins with the definitions and properties of topological spaces and ideals. Further, this book gives insight into the concepts of general topology via ideals. The results of limit point, generalized closed sets, separation axioms, compactness, connectedness and continuity have been discussed using ideals. Analogues of known results and some counter examples are also given.