15 Hair-Color Terms to Know Before Your Next Salon Appointment

"[Highlighting] is the act of lightening pieces of the hair with the use of color or bleach and folding them into a foil to let the color process," celebrity hairstylist Clariss Rubenstein previously told POPSUGAR. "Typically, there is a structured pattern the colorist follows when applying highlights."

Maria Elizabeth, hairstylist and owner of Salon deZEN, adds: "Foil highlights start directly at the roots of the hair to create anywhere from lower contrasting highlights called babylights to highly dimensional hair color. The amount of the contrast is visually created by taking larger or smaller sections and not just by making the hair itself lighter."