Vector Art VS Raster Art
Raster images are made up of tiny colored squares called pixels. Vectors are made up of mathematical calculations from one point to another to create curved lines.
The resolution of an image is determine by how many of those tiny square pixels fit in an inch, you may have heard the term pixels per inch (PPI) or dots per inch (DPI). As you zoom in on (or blow up) a raster image there are fewer pixels in each square inch and this causes the resolution for degrade. When you print something you want to print from high resolution artwork. Vectors can be blown up or shrunk to any size, there is no such thing as a low resolution vector.
The image below shows a raster background and the word "RASTER" is also rasterized. The word "VECTOR" is vector. Notice how smooth the teal vector edges are even when you zoom in to the pixel level. You can see how the white raster edges and background are degraded at the pixel level.
