This course will teach you the importance of persistence and how to apply it to your life. You will learn how to stay focused on your goals and how to keep going even when things seem impossible. You will also learn how to use positive thinking and self-motivation to stay on track and
From Wikipedia
In computing, a persistent data structure or not ephemeral data structure is a data structure that always preserves the previous version of itself when it is modified. Such data structures are effectively immutable, as their operations do not (visibly) update the structure in-place, but instead always yield a new updated structure. The term was introduced in Driscoll, Sarnak, Sleator, and Tarjan's 1986 article.