What does the hexadecimal code #FF0000 represent in HTML?

The hexadecimal code #FF0000 in HTML represents the color primary red. In the hexadecimal color system, the first two characters, "FF," indicate the intensity of the red component, while the subsequent pairs, "00" and "00," represent the absence of green and blue, respectively.

In the RGB color model, colors are created by combining red, green, and blue light, with each component having a value from 00 to FF (0 to 255 in decimal). Since #FF0000 has the maximum value of red (FF) and no green or blue (both set to 00), it produces a bright, pure red color. Understanding this color coding system is essential for web design and development, as it allows for precise control over color representation in HTML and CSS.