Book excerpt: This book provides glycoscientists with a handbook of useful databases that can be applied to glycoscience research. Although many databases are now publicly available, one of the hurdles for their users is the learning curve required to effectively utilize those databases. Therefore, this book not only describes the existing databases, but also provides tips on how to obtain the target data. That is, because many databases provide a variety of data that could be obtained from different perspectives, each chapter provides users with potential biological questions that can be answered by a particular database and step-by-step instructions, with figures, on how to obtain that data. Troubleshooting tips are also provided to aid users encountering problems that can be predicted when using these databases. Moreover, contact information for each database is provided in case unexpected issues arise.