Welcome to the online supplement for Part I of the third edition of Information Services Today: An Introduction, edited by Sandra Hirsh, Ph.D. This online supplement contains additional information to extend your learning and understanding of the topics covered in this book. Specifically, you will find supplemental online resources, recommended readings, appendixes, and additional content that does not appear in the book. See also the webinars for this section at https://bit.ly/info_svcs_today_3rd_2022.