They might well be a starting point for a story.
A character that you've dreamed up.
A situation that this character finds themselves in.
Perhaps you have an ending in mind for a story.
How will you get to this ending?
Getting this character or group of characters from A-to-B-to-C and so on.
A scene that keeps playing out in your head that you can't get rid of.
A bit of dialogue.
A bit of action.
What if this happens?
What if that happens?
What's the essence of this story?
What's it really about?