Food security is a complex issue with no single definition. It involves ensuring all people have access to sufficient, safe, nutritious food through physical and economic access. Key elements include availability, accessibility, adequacy, acceptability and agency. Food security is interconnected with other issues like food sovereignty, sustainability, safety, justice and linked to broader systems like climate, environment, politics and economics. Understanding food security requires a systems perspective as it exists within complex, multidimensional environments that structure discourse and experiences around food.