The production of fluids secreted by the sweat glands is referred to as perspiration. Sweat, which is composed of mostly water, minerals, lactate and urea, allows the body to regulate its temperature. For the most part, human perspiration is odorless. However, once it comes into contact with hot and humid environments the moisture becomes fermented by bacteria, which causes body odor.
The underarm or armpit is one of the most consistently warm areas on the body. Deodorant, classified as cosmetics and regulated by the U.S. Food and Drug Administration (FDA), have been designed to prevent odors from these particular sweat glands. The top selling deodorant brand in the United States in 2012 was Degree Men which generated about 78.4 million U.S. dollars and accounted for 5.9 percent of all deodorant brand sales.
Deodorants come in many forms and range in popularity depending on the country or region. For instance, aerosol sprays, creams and roll-on forms are very popular among Europeans whereas solid or gel forms are the desired forms in the United States and Canada.