Online intervention refers to the use of internet-based technologies, such as websites, applications, or virtual platforms, to deliver psychological or behavioral interventions to individuals. These interventions can target a wide range of issues, including mental health disorders, substance abuse, smoking cessation, weight management, and chronic disease management. Online interventions have the potential to reach a large number of people and can be accessed at any time and from any location, making them convenient and cost-effective compared to traditional face-to-face interventions. They can also be tailored to individual preferences and needs, allowing for a more personalized approach to treatment. Research in the field of online intervention aims to evaluate the effectiveness, feasibility, and acceptability of these interventions in comparison to traditional methods. Studies may explore factors such as user engagement, adherence, outcomes, and potential barriers to implementation. Overall, online intervention research is focused on developing evidence-based approaches to improve access to care and support positive health outcomes for individuals.