Hexadecimal colors are a way to represent colors in digital design using a six-digit code. Each code starts with a hash symbol (#) and consists of numbers and letters. The first two digits represent the red component, the next two represent green, and the last two represent blue. Each component can range from 00 to FF in hexadecimal notation, which corresponds to 0 to 255 in decimal. This system allows for over 16 million possible colors, making it a popular choice for web design and graphic applications. By mixing different amounts of red, green, and blue, designers can create a wide variety of colors to enhance visual content.