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Questions asked by users might not always be phrased in the clearest way.
Shampoo's ability to create foam is related to its surfactant content. Surfactants, like Sodium Laureth Sulfate (SLES) and Sodium Lauryl Sulfate (SLS), are molecules with both hydrophilic (water-loving) and hydrophobic (water-hating) parts. They work by reducing the surface tension of water, allowing it to mix more easily with oils and dirt on your hair and scalp, leading to the foamy action you see.