The word "maybe" is used to express uncertainty or possibility. It indicates that something could happen or be true, but it is not definite. When you use "maybe," you are suggesting that there is a chance of something occurring, but there is no guarantee.
The term "maybe" is a combination of "may," which implies permission or possibility, and "be," indicating existence or presence. It originated in the early 20th century, evolving from the phrase "may be."