"Flyers" can refer to a few things, depending on the context :

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Handbills or leaflets:

This is the most common meaning. Flyers are small, often printed sheets of paper used for advertising, announcements, or distributing information. They are typically distributed by hand, left in public places, or inserted into newspapers or magazines.

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The Philadelphia Flyers:

This refers to a professional ice hockey team based in Philadelphia, Pennsylvania, that plays in the National Hockey League (NHL).

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A type of aircraft:

In some contexts, "flyers" might refer to aircraft or airplanes in general, though this usage is less common.

To understand what "flyers" means, you need to consider the context in which you encountered the word.