This article provides an overview of psychological phenomenon – resilience. This term had appeared rather recently, approximately in 20^th Century. The term ‘’resilience’ was entered by Salvatore R. Maddi. He was a famous professor of social ecology in California’s University. We consider the overview of resilience’s problem in the context of Salvatore R. Maddi’s research and his ideas. Also, we are going to show the ‘resilience’ term from different points of view. We separate this term from as similar terms as volition, positive thinking, etc. «What is resilience? » and «Why someone has high resilience’s level, while somebody does not has resilience at all ». We will consider all resilience’s developing conditions in the context of this article.