Explain the difference between RGB and CMYK color modes.

RGB and CMYK are two different color models used in digital imaging, each with its own purpose and characteristics.

1. **RGB (Red, Green, Blue)**:
   - RGB is an additive color model used in electronic displays such as computer monitors, television screens, and digital cameras.
   - In RGB, colors are created by combining different intensities of red, green, and blue light. These colors are additive because they start with black (no light) and add more light to create colors. When all three colors are at their maximum intensity, they produce white light.
   - The range of colors that can be produced in RGB is called the "gamut," which is relatively broad and well-suited for displaying images on screens.
   - Common file formats that use RGB include JPEG, PNG, GIF, and RAW.

2. **CMYK (Cyan, Magenta, Yellow, Key/Black)**:
   - CMYK is a subtractive color model used in color printing, typically for things like magazines, brochures, and other printed materials.
   - In CMYK, colors are created by subtracting varying amounts of cyan, magenta, yellow, and black ink from a white background. This means that the more ink you add, the darker the color becomes.
   - CMYK is called "subtractive" because it starts with white (the color of the paper) and subtracts color to create different hues. When all colors are at their maximum density, they produce black.
   - The range of colors that can be produced in CMYK is narrower than RGB and is referred to as the CMYK color gamut.
   - Common file formats that use CMYK include PDFs intended for print and design software files like Adobe InDesign and Illustrator.

In summary, RGB is used for digital displays where colors are created by adding light, while CMYK is used for print media where colors are created by subtracting ink from a white surface. Each has its own strengths and limitations, so it's essential to choose the appropriate color mode depending on the intended output medium.