* Genre: What kind of story are we talking about? Romance, fantasy, mystery, etc.?
* Format: Is it a book, a movie, a comic book, or something else?
* Time period: Are we looking at all-time sales or just recent sales?
* Region: Sales figures vary by location. What region are we looking at?
To provide a meaningful answer, you'd need to specify the criteria you're using to define "most popular."
For example:
* Most popular book of all time: This might be a book like *The Bible* or *The Little Prince*, which have sold hundreds of millions of copies.
* Most popular novel of the last decade: This could be a book like *The Girl with the Dragon Tattoo* or *Gone Girl*, which have both been international bestsellers.
* Most popular movie of 2023: This would depend on box office revenue and could be a movie like *Barbie* or *Oppenheimer*.
Once you define your criteria, I can help you find the most popular story based on sales figures.