It's a broad category that encompasses various aspects of photography, including:
* Techniques and processes: Taking pictures, developing and printing, digital photography, etc.
* Types of photography: Portrait, landscape, wildlife, photojournalism, etc.
* Equipment: Cameras, lenses, lighting, etc.
* History and theory: The evolution of photography, its role in art and society.
Within this category, you can find more specific subcategories represented by decimal numbers:
* 775.01: History and theory of photography
* 775.1: Photographic processes
* 775.2: Photographic equipment
* 775.3: Applications of photography (e.g., photojournalism, scientific photography)
* 775.5: Portrait photography
* 775.7: Landscape photography
* 775.9: Specific photographers and schools of photography
So, if you're looking for books about photography, you'd find them in the Dewey Decimal classification system under 775, and then further subcategories depending on your specific interest.