The document discusses the impact of information and communication technologies (ICT) on personal and population health, highlighting significant public health achievements and the importance of behavior change in reducing health risks, such as smoking and obesity. It presents various models and theories of behavioral change, alongside case studies demonstrating the efficacy of web-based interventions in promoting smoking cessation among youth. Additionally, it underscores the need for effective health literacy to enable individuals to seek and understand health information, ultimately improving health outcomes.