From what I know, hair extensions are like wigs that is attached to the real hair. However, you cannot just buy hair extension and attach it yourself. On of mmy nieces had one which, she said, was attached in the salon. And it is a long and tedious process so maybe we should not dare do it at home. Her hair extension looked so natural that I did not suspect it to be fake hair. By the way, the hair is not synthetic, it is real hair that’s why it is expensive.