thumb|right|upright=1.3|Shampoo lather in hair thumb|right|upright=1.3|Bottles of shampoo and lotions manufactured in the early 20th century by the C.L. Hamilton Co. of [[Washington, D.C., United States]]
Shampoo is a cleaning product used to wash hair, creating lather as shown in the image. The product has been manufactured commercially for over a century, with companies like C.L. Hamilton Co. producing it since at least the early 20th century.
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thumb|right|upright=1.3|Shampoo lather in hair thumb|right|upright=1.3|Bottles of shampoo and lotions manufactured in the early 20th century by the C.L. Hamilton Co. of [[Washington, D.C., United States]]
Shampoo () is a hair care product, typically in the form of a viscous liquid, that is formulated to be used for cleaning (scalp) hair. Less commonly, it is available in solid bar format (not to be confused with "dry shampoo" which is a separate product). Shampoo is used by applying it to wet hair, massaging the product in the hair, roots and scalp, and then rinsing it out. Some users may follow a shampooing with the use of hair conditioner.
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