Final answer:
A perm is a chemical process that alters the hair's structure to create lasting curls or waves.
Explanation:
A permanent wave, often referred to as a perm, chemically alters natural hair to create a curly or wavy pattern that lasts for several months. This process involves the use of chemicals like ammonium thioglycolate to break and reform bonds in the hair structure, resulting in the desired style.
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