Why do Lice want to live on your head?

What exactly are lice? How do lice feast on your scalp? How can you get rid of lice (or avoid them in the first place?) For free home activities sign-up at www.WhoSmarted.com  See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.