A backstory is the history or background of a person, character, or situation that explains why things are the way they are now. In stories, a character's backstory includes everything that happened to them before the story begins: where they grew up, important events they experienced, and how those experiences shaped who they became.

When you read about a detective who's afraid of water, the backstory might reveal that she nearly drowned as a child. When a friend seems nervous about trying out for the play, their backstory might include a time they forgot their lines in front of the whole school. Understanding someone's backstory helps explain their behavior, fears, and motivations.

Writers don't always reveal the entire backstory at once. They might drop hints throughout the narrative, letting readers piece together why a character acts a certain way. Sometimes the backstory is more interesting than the main story itself.

Outside of fiction, people use this word for real situations too. A reporter might investigate the backstory of a local controversy to understand how it started. When you explain to a new friend why your family celebrates a particular tradition, you're sharing the backstory. The word helps us remember that everyone and everything has a history that led to this moment.