The word “days” is the plural form of “day.” In English, a “day” typically refers to a period of 24 hours, which is the time it takes for the Earth to rotate once on its axis. It can also refer to a specific period of time in a person’s life or a particular calendar day, such as Monday or January 1. Additionally, “days” can denote a general period characterized by certain activities or events, such as “the days of our youth.”