Pixel art is a form of digital art and it is unique visual style, where individual squares serve as the blocks that make up the image. The effect is very similar to that of mosaic art. Its also made n the year 1978 in a game called invader

Pixel art help you to focus and isolate what is most important in an image and use only the things providing the smoother it is the more control you could apply in a more detailed drawing style.