Security - the concept humanity has been experiencing since time immemorial. In connection with the concept of security, other closely linked terminological verbs or words are used that can sound the same in different areas of human activity, but can be added to other meanings. These words are usually terms of safety, danger, threat, human security, technological security, etc. Terminology in the field of "security sciences" has not yet been resolved. We offer readers different perspectives on the definition of some entities that are perceived differently by different authors and we want to contribute to the understanding of the contents of the key concepts of "security" and "safety“.