Do you know what a pixel is?
Pixel (picture element)
Tiny dots that make up a computer image. The more pixels a computer monitor can display, the better the image resolution and quality. On a color monitor, every pixel is composed of a red, a green, and a blue (RGB) dot that are small enough to appear as a single entity.
There is an artist by the name of Chuck Close who painted portraits of people by breaking them down into small pixel units. From a distance, his work looked very realistic, but up close you can see his pixel approach. Example:

Do you know what the acronym RGB stands for in the world of web design & computer graphics?
In the world of web design and computer graphics color can appear different on different monitors. To minimize this problem, 256 web safe colors were developed so that color would consistently look the same on any monitor screen. A hex triplet is a six-digit, three-byte hexadecimal number used in HTML, CSS, SVG, and other computing applications, to represent colors. The bytes represent the red, green and blue components of the color.
The hex triplet is formed by concatenating three bytes in hexadecimal notation, in the following order:
  • Byte 1: red value (color type red)
  • Byte 2: green value (color type green)
  • Byte 3: blue value (color type blue) --- thus producing the RGB color approach
  • For example an orange color would be represented as: #FF9900
rgb.jpgHex Color Code Chart