ENSecurity is the most important value of people, because every person seeks to avoid threats to his life, health, freedom, and property, regardless of his age, group and national affiliation or other features related to human existence. However, now the trend of escalating a new world war is again expanding in the world. This sad statement is confirmed by the ongoing and expanding wars: Russia attacked Ukraine, the terrorist organization "Hamas" started a war with Israel. This alarming trend forces us to examine the meaning of security and peace. The meaning of any social phenomenon is analyzed in detail when its separate significances are revealed. The article examines the complex significances of security and peace: socio-cultural, historical - political, just war and psychological. The sociocultural significance of security and peace is explained based on the closely parallel evolution of the human mind and community. The political significance of security and peace is determined by the need to maintain just order in society and between countries, i. e., to resolve social conflicts (wars) through negotiations and other means, when the parties are unable to resolve them peacefully by themselves. The consequences of wars conditioned the development of just war concepts and their importance in restoring peace and security. The psychological significance of security and peace is explained based on the satisfaction or lack of basic human needs. The research is based on document analysis and complex interpretation of the obtained data. The article presents the conclusions of a comprehensive study. Keywords: Security, peace, socio-cultural significance of security and peace, historical – political, just war and psychological significance of security and peace. [From the publication]