Underage sales refer to the sale of age-restricted products or services to individuals who are below the legal age limit. The sale of certain products or services to individuals who are under the age of 18 or 21 (depending on the country or state) is typically prohibited by law, as these products or services may have negative health or societal impacts on young people. Examples of age-restricted products or services include tobacco, alcohol, gambling, and certain types of entertainment or media.

Retail stores and other businesses that sell age-restricted products or services are required to implement age verification measures to ensure that they do not sell these products or services to individuals who are under the legal age limit. This may include ID scanning or other methods of age verification, such as requiring individuals to present a valid identification document or using online verification services.

It is important for businesses to ensure that they are complying with age restrictions to avoid legal consequences and to protect the health and well-being of young people. Underage sales can also lead to negative consequences for the individuals who are underage and consume the age-restricted products or services, as these products or services may have negative impacts on their health or development.