In the United States products are taxed at the state, county, city levels, in addition to any local specific taxes. The sales tax is a tax on sales of retail of goods to end consumers.
Sales & Use Tax
Retail sales tax is a tax on sales of retail of goods to end consumers. Use tax is essentially the same as a sales tax but is applied not where a product was sold but where a merchant bought a product and then converted it for its own use, without having paid tax when it was initially purchased.