Final answer:
The full base in hairstyling means the hair roller is placed fully at the scalp, aimed at creating maximum volume and lift at hair roots.
Step-by-step explanation:
The phrase "also known as full base. For full volume, the roller sits directly on its base" refers to a hairstyling technique used in the beauty industry. When hair rollers are set on the head, the term 'full base' means that the roller is placed at the scalp area such that the entire bottom of the roller sits flat against the scalp. This technique is designed to produce maximum volume and lift at the roots of the hair. The method involves sectioning the hair appropriately, using rollers that match the desired size of the curl or volume, and positioning them correctly on the head for achieving the full-volume effect. The choice of roller size, hair texture, and the dampness of hair can all influence the final result.