EN
This article presents the basic terminology for contemporary security concepts. It defines the concept of security itself and related terms such as security as a need and value, subjective and objective security, security as a process, external and internal security, subjectand object-related dimension of security, security analysis levels, security categories: political, military, economic, cultural and identity-based, environmental and societal, as well as security opportunities, challenges and threats. The terminology presented in this article is a synthesis of the author’s reflections on theoretical foundations of security published in the monograph: Bezpieczeństwo. Zarys teorii (Security: A Theoretical Outline) published by the Academic Publishing House of the Pomeranian University in Słupsk.