This module aims to explore Digital Contact Tracing (D-CT) developed and implemented in Ireland for the COVID-19 response. Focus is on their D-CT app, COVID Tracker Ireland, and understanding user-uptake. The case study begins with a brief overview of the country���s overall response to COVID-19 and the impact of the virus on the country. Following, we explain Ireland���s app by describing how it emerged, how it is designed and functions, how users engage with the app across the whole user-engagement process, and what user-uptake looks like in the country. The next section describes the main factors that emerged in our research for this country that suggest influencing user-uptake within the country���s context including public perceptions, sense of community, communications & misinformation, accessibility & inclusion, and public trust. This section ends with a brief conclusion.