What is back page meaning?

Back page refers to a classified advertising website that was shut down by the United States government in 2018 for facilitating the sale of sex services and human trafficking. The website gained notoriety for its "adult" section, which was used by sex workers to advertise their services. However, it was also used by non-sexual businesses and individuals to advertise goods and services. After its shutdown, several other similar platforms emerged, but the term "back page" remains associated with the original website and its controversial activities.