👉 In "in" it is used as a pronoun, typically referring to something that has been improved or enhanced. It can also mean improvement or enhancement of some kind. For example: 1. The company's management team has made significant improvements over the past few years. 2. He has shown great inmprovement in his work skills. In "out" it is used as a verb, meaning to improve or make something better. It can also be used in conjunction with other words like