This book is an introduction to the field of polymers that balances chemistry, physics, and engineering applications. It updates a classic text that continues to find use in a number of universities for introductory polymer courses, but has not been updated since its 1993 printing. This revised and updated edition focuses on new technologies that use polymers, new feedstocks, polymers derived from biological sources, new strategies for polymerizations, and analysis of polymers. Further, the 3rd edition includes new homework problems and examples. With the updates mentioned, the book evolves to include new ideas and concepts, while remaining friendly to students who are exposed to the polymer field for the first time.