A layer cut for long hair is a hairstyle that involves cutting the hair into different lengths, creating layers. This can be done to add volume, movement, and shape to the hair. For example, a popular variation is the "Rachel" haircut, which was made famous by Jennifer Aniston in the 90s TV show "Friends".
Layering long hair can provide several benefits, such as reducing weight, enhancing texture, and accommodating various face shapes. It also has a rich history, tracing back to ancient civilizations where it was used to signify status and cultural identity.