**Preface to "Modification of Hydrogels and Their Applications in Biomedical Engineering"**

Hydrogels and hydrophilic polymer networks play an important role in biomedical engineering due to their good biocompatibility, biodegradability, hydrophilicity, and mechanical properties, similar to those of some soft tissues. However, single-component hydrogels usually do not meet the basic functional requirements of biomedical engineering, and modification is an effective way to improve the properties of hydrogels. Currently, a variety of multifunctional hydrogels with excellent performance have been developed, which greatly promotes the application of hydrogels in biomedical engineering.

This reprint focuses on the modification of hydrogels and their applications in biomedical engineering, aiming to provide a reference for scholars in related fields. It mainly involves the applications of hydrogels in biomedical fields such as phantoms, wound healing, skin, cartilage, muscle, and drug loading. We believe this book can provide a valuable reference for scientific and technological workers in the fields of materials science, tissue engineering, biological manufacturing, biomedical engineering, and so on.

We would like to thank all the contributing authors whose expert contributions made the publication of this Special Issue possible. We would also like to express our deepest appreciation to the editorial team, especially Ms. Miranda Song at MDPI, for their encouragement, technical guidance, editing, and publication of this Special Issue. Special thanks go to all reviewers for helping us ensure the quality of each published article.

> **Yanen Wang and Qinghua Wei** *Editors*
