The WHO European Office for the Prevention and Control of Noncommunicable Diseases organized an expert meeting on monitoring of digital marketing of unhealthy products to children and adolescents in June 2018. Based on that meeting, this report aims to provide a tool to support Member States in monitoring digital marketing of unhealthy products to children; the resulting tool – the so-called CLICK monitoring framework – is flexible and can be adapted to national context. The report also describes current digital marketing strategies, the challenges arising from current practices, and some policy options to tackle digital marketing to children and adolescents.