Advocacy is a deliberate and strategic process of influencing decision-makers, stakeholders, and communities to bring about positive social, policy, and behavioural change. In the context of Social and Behaviour Change (SBC), advocacy focuses on shaping policies, laws, resource allocation, institutional practices, and social norms that create an enabling environment for desired behaviours. While Social and Behaviour Change Communication (SBCC) often targets individuals and communities to adopt healthy or socially beneficial practices, advocacy primarily targets leaders, policymakers, institutions, and power holders who can create systemic change. It involves presenting evidence, mobilizing support, framing issues effectively, and engaging in dialogue to ensure that public policies and programs reflect the needs and rights of populations. Advocacy plays a crucial role in addressing complex social issues such as maternal and child health, gender equality, environmental protection, education, and public health emergencies. For example, promoting immunization uptake is not only about educating parents but also about advocating for adequate vaccine supply, supportive policies, funding, and trained health workers. Thus, advocacy strengthens the structural foundation necessary for sustainable behaviour change. One important tool of advocacy is policy briefs and evidence-based documentation. Policy briefs are concise, well-structured documents that present research findings, data, and clear recommendations to policymakers. They translate complex information into accessible language, highlighting the urgency of an issue and proposing actionable solutions. In SBC, evidence-based advocacy is essential because decision-makers often require data to justify changes in policies or budget allocations. For instance, to advocate for improved menstrual hygiene management in schools, organizations may compile data on school absenteeism among adolescent girls, health risks associated with poor hygiene, and cost-benefit analyses of providing sanitary facilities. A well-prepared policy brief can persuade education departments to allocate funds for separate toilets and sanitary pad distribution. By grounding advocacy in credible evidence, stakeholders enhance their legitimacy and influence. Another powerful tool of advocacy is media engagement. Media serves as a bridge between advocacy groups and the wider public, amplifying issues and shaping public opinion. This includes traditional media such as newspapers, radio, and television, as well as digital and social media platforms. Through press releases, opinion articles, interviews, talk shows, and social media campaigns, advocates can highlight social issues and create public pressure on decision-makers. For example, in campaigns against child marriage, advocacy groups often use radio dramas, news stories, and social media hashtags to raise awareness about the harmful consequences of early marriage. When the issue gains visibility and public concern increases, policymakers are more likely to respond