Many people think their hair is damaged when it's actually dry. Dry hair usually looks and feels frizzy, with many split ends. It can be caused by heated styling tools, not using conditioner, repetitive coloring treatments, chemical perms, and over exposure to the sun.
Damaged hair is usually brittle (cracks or breaks easily), elastic, and stretches if you pull on it. It's often caused by bleaching, frequent relaxers, and repetitive chemical treatments.