PIXELS
Pixels, short for picture element, are the smallest possible components of a digital image. Each pixel has the positional information and intensity information. The intensity of each pixel is changable. When pixels are used in a coloured image, a colour is represented by three or four component intensities like red, green and blue.
The resolution of a display device is the amout of distinct pixels in each element that is shown. Usually mentioned as width x height this signifies the amount of pixels in a given area.
RASTER GRAPHICS
A raster graphic is made up of pixels, also known as bitmap graphics, raster graphics are resolution dependent as they cannot increase size without losing the image quality, which doesn't make it ideal for photographs. It contains larger file sizes than Vector graphics as the vector graphic doesn't carry as much detail, this is why raster graphics are mainly used for photo-realistic images and photographs, they are used extensively across the internet.
VECTOR GRAPHICS
Vector graphics are completely dependant on geometrical primatives such as curves, points and lines. They work by leading through control points around the X and Y axis. Each fragment can be changed in colour, thickness, shape and fill of colour. It doesn't affect the size of the file as all the information is in the image, and it describes how to draw the image. This process is used alot for illustrations ,logo's and fonts for business's as it can be resized without loss of quality however there isn't a large amout of detail to start with.
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