The present article deals with the theoretical aspects of food insecurity and its concept, causes, effects and possible solutions at the global and national level. Food security can be easily defined as enough food is available at the community or household level, national and global level. Food security is based on four (pillars; availability, accessibility, utilisation and stability). Availability addresses the “supply-side” of food security and is determined by the level of food production, stock levels and net trade. Accessibility is concerns about insufficient food access have resulted in a greater policy focus on incomes, expenditure, markets and prices in achieving food security objectives. Utilization is commonly understood as the way the body makes the most of the various nutrients in the food. Stability is typically linked to the vulnerability context, and risk factors can negatively impact food availability or access to food. Simply food insecurity is defined as when a person is unable to obtain a sufficient amount of healthy food on a day-to-day basis. Food insecurity act as both cause and effect, due to lack of income and access food insecurity prevails and, in another way, due to food insecurity, violence and instability occur in a country. The leading cause of food insecurity is poverty, increasing population, drought, etc. These causes in food insecurity affect the population in the form of malnutrition, vulnerability and stunted children. The solutions for these problems in food insecurity are awareness, decrease food waste and donations, etc.