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Raster vs Vector.
When working with digital photos, graphic design, logos and other digital images, raster and vector are the two most common file types you’ll encounter. Learn about the key features, similarities and differences between the two to decide when and where to use each.
What is a raster file?
Raster files are images built from pixels — tiny colour squares that, in great quantity, can form highly detailed images such as photographs. The more pixels an image has, the higher quality it will be, and vice versa. The number of pixels in an image depends on the file type (for example, JPEG, GIF or PNG).
What is the difference between raster and vector files?
Raster and vector files are the two most popular formats used for visual content. They represent images in very different ways, so there’s a lot to consider when deciding which one to use. Some of the main differences between raster and vector include:

Resolution.
One of the main differences between raster and vector files is their resolution. The resolution of a raster file is referred to in DPI (dots per inch) or PPI (pixels per inch). If you zoom in or expand the size of a raster image, you start to see the individual pixels.