Esther S. answered 08/10/20
Art Director and Graphic Designer in the marketing industry
A rasterized image is made up of a number of tiny pixels (squares or dots) of color that fill up a certain area. The higher of number of pixels in the area, the greater quality of the image.
When working or manipulating these kinds of images, rasterized images are mostly described as photograhic type images but also can be drawn or compiled. Because of a fixed number of pixels, there are limitations on how large you can increase the size and the bulky file size itself.
If you put a newspaper ad under a magnifying glass or microscope you can see the color dots. If you zoom on a photo image on screen enough you will see the individual pixels.
I like to describe vector images like they are created (drawn or traced) through a program using mathematical equations using lines and curves. Vector images can be very simple or complex depending how the artist created it but it will most likely will not look like a photograph. Majority of logos are originally made as a vector file.
Virtually and in the creation process, the integrity/quality of the line and curves will always be the same no matter how large or small you resize it. The file size for a vector image most likely be significantly less than a raster image depending on the complexity of the drawing.