An 'excise tax' is also referred to as a consumption tax, a sin tax, or a selective tax. A consumption tax is a tax on goods and services consumed, while a sin tax is a type of excise tax on products that are considered harmful such as cigarettes or alcohol. A selective tax is imposed on a specific group of commodities and services, such as gas, luxury goods, or telecommunications services. Additionally, a specific tax may also be used as a synonym for excise tax, as it is a tax that is levied on a specific commodity or service. Regardless of the term used, the purpose of an excise tax is to generate revenue for governments while discouraging the usage or purchase of specific products.