Benefits of Lowlights
A: Lowlights are called such because they are generally slim strands of color that is darker than the hair's natural color. You can add lowlights to the hair to create a more dimensional look and deepen the hair's overall color profile, and generally, the more colors you incorporate, the richer and more natural the color results will be.
It also means that lowlights can be added using semi- and demi-permanent color formulas which means that you can try out the look without a permanent commitment to changing the color of your hair. (Semi- and demi-permanent colors wash out in 6-12 shampoos, normally.)
Lowlights are also great for correcting cases where the hair is "over-highlighted" such as when the individual has had so many highlights placed in the hair that the hair looks out of balance. It lets you create a more natural look by targeting the exact areas that you want to add color. (In normal cases of "over-highlighting" the solution is often an all-over toner application that darkens all the hair in order to create a muted effect.)
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See also:
How to color hair
Highlighting and highlights
What is the difference between highlights and lowlights?