What does the term 'balayage' refer to in hair coloring?

Balayage refers to a technique in hair coloring where highlights are hand-painted onto the hair in a way that creates a natural, sun-kissed look. This method allows for a softer, more blended effect compared to traditional foiling techniques. By applying color with a freehand motion, the stylist is able to create dimension and movement within the hair, resulting in a striking yet effortless appearance. This technique also enables more control over the placement and intensity of the highlights, giving clients a customized result that enhances their natural features.

The other options describe different hair practices or applications unrelated to balayage. Solid color applications involve covering the entire strand of hair with one uniform color, while curling hair refers to various methods used to create curls and waves. Hair extensions pertain to the addition of hair to enhance length or volume, which is not related to the coloring technique of balayage.