This book presents the first results from the third cycle of the IEA International Computer and Information Literacy Study (ICILS 2023). This study investigated how young people are prepared for life in a world where the capacity to use computers and digital information responsibly, safely, and effectively is essential. The study reports on data collected from 34 countries across Europe, the Americas, and Asia. This first volume in the ICILS 2023 International Report Series focuses on Grade 8 students' achievement in the two areas tested in the study: i) their capacity to use digital technologies to collect and manage digital information and to produce and exchange information with others; and ii) in a subset of 22 participating countries, students' ability to plan and execute computer-based algorithmic solutions to real-world problems. This book also presents information about the school-based and out-of-school contexts in which students are learning these skills, and how aspects of these contexts are associated with student achievement.