Closed (/kləʊzd/) can be the past tense form of the verb close, but it can also function as an adjective. As an adjective, closed means 'not open'. Confusion often arises when people intend to describe something as not open, which requires the use of the adjective closed, but they mistakenly use the word close instead.

As an adjective close means nearby. For example: She stood close to the exit so that it would be easy to leave at the end of the concert. As a verb to close means to shut. For example: At the beginning of the performance the ushers close all the doors. Closed is an adjective that means not open. For example: The doors were closed.

"Close" can refer to a short distance or nearness in space, time, or relationship, suggesting something is nearby or intimate. On the other hand, "Closed" is primarily used to describe something that is not open, such as a door, a business, or an opportunity, indicating a complete or partial barrier to access.

Close - the present tense of closed Please close the door. Mary close the book. Please close the window in the room Closed - not open They closed the door. Mary closed the book before her mother came into the room. They closed the window in the room, before they left.