Designers can spend hours poring over the tracking and kerning of their typography. It’s important, however, to understand that the two things are not synonymous.
Tracking, as we’ve already mentioned above, deals with the spacing between characters across an entire word or phrase. Kerning is an adjustment of the specific space between two characters in particular. Kerning is often used to bring characters that naturally have a lot of white space around them closer to their neighbours.
A good example is the combination of the letterforms W and A, which can sit closer together than most fonts will naturally place them, due to the complementary angles that make up their shapes.