Graphic files

Raster Graphic file:
A raster graphic file is an image which is broken down into little squares - a grid, by the computer, each square in this grid is known as a pixel.
The pixel will scan the colour in the square of the grid and place the correct colour in the square.
The less of the pixels in a image will make the picture more simple and blocky.
The more pixels you have, the more detailed the image gets, if you start with a basic 16x16 pixel grid, your image will be blocky, if the image is 1 megapixel (1,000,000 pixels), the image will be detailed and the blockiness of the image will turn into a smooth curvature.

This is an example of a raster image, note it's blockiness, meaning less pixels are used.

Vector Graphic file:

A vector graphic file is a computer's version of dot-to-dot in images.

Vector files are made up of points and lines called anchors and paths, the anchors are what you place on the file, they are the points and foundations of the image, once placed, the computer will connect the anchors together with lines called paths, this line could be straight or curved.

What may seem simple, vector graphics will never go into pixelation, if you expand the anchors position, the computer will simply re-draw the image.

Pixels:

Pixels are the squares in a grid of an image, a pixel is a square within the grid, within this pixel, the computer chooses the correct colour for the image and places it on the picture.

The higher the pixels, the more detailed the image is.

The grid used is called a bit map.

Resolution:

The resolution is the measurement of the pixels used in a raster graphic file. If the resolution is the high, so is the quality of the pixels in the raster file.