What are formats?
The definition of formats is the way in which something is arranged or set out. In film, formats are the way in which the image is arranged and set out. Specifically here we are talking about the resolution of an image and how it is set out.
The different types of formats for film are 360p, 720p and 1080p.
The image above explains the different types of formats visually. The blue part of the image is standard TV in terms of pixels. As you can see the blue image will produce a good quality image with the amount of pixels used in standard television to a small size. This means that the image will remain clear and good quality only to a small size. If the size increased, it would decrease in quality.
The green section represents 720p. As you can see it can produce a high quality picture that covers a larger space than standard 360p.
Finally, the orange section is 1080p HD. It can produce a high quality image for the largest amount space.