Which technique is commonly used to add volume to hair?

Layering is a widely used technique in hairstyling that effectively adds volume to hair. This method involves cutting the hair at various lengths, creating different layers. The shorter layers on top can create more height and body, allowing for a fuller appearance overall. When styled, these layers can lift the hair away from the scalp, adding dimension and movement, which enhances the overall volume.

While the other techniques serve different purposes, they do not primarily focus on volume enhancement. Blunt cutting creates a straight across edge that can make hair appear thicker but does not add the same level of volume as layering. Point cutting is used to soften edges and texturize the ends of hair, which can help reduce bulk or create a more blended look but isn't designed specifically for volume. Thinning reduces the density of the hair, which can sometimes help with managing volume but does not add to it. Thus, layering stands out as the most effective technique for volume enhancement in hairstyling.