In paragraph 9 of the passage, the meaning of the word "categorize" is to classify or organize advertisements into distinct groups or types based on their characteristics or formats.
It refers to the action of grouping advertisements based on specific criteria or commonalities they share, potentially aiding in the understanding and analysis of advertising strategies.
In the context of the passage provided, "categorize" in paragraph 9 likely refers to the action of sorting or classifying advertisements into different groups or types based on common formats, techniques, or characteristics they possess.