As a separator for multiple word or descriptive file names, you would use a hyphen or an underscore.

Search engines consider underscores as joiners and hyphens as separators.

For a file name such as red_fashion_shoes.html or red_fashion_shoes.jpg :

To a search engine, would be same as redfashionshoes.html or redfashionshoes.jpg,
The three Keywords are joined by the underscore separator.

For a file name such as red-fashion-shoes.html or red-fashion-shoes.jpg

To a search engine, would be the same as red fashion shoes.html or red fashion shoes.jpg
The three Keywords are separated by the hyphen seperator.

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