Fly-posting, also known as bill posting, is the illegal practice of plastering posters and advertisements on public and private property. There are several synonyms for this term, including sniping, wheatpasting, wild posting, and guerrilla advertising. Sniping involves attaching posters to street furniture, while wheatpasting involves using wheat-based glue to stick posters on surfaces. Wild posting involves placing posters on unconventional locations, such as abandoned buildings or construction sites. Guerrilla advertising employs unconventional methods to advertise products and services, often involving viral marketing campaigns. Regardless of the term used, fly-posting is considered a form of visual pollution and is subject to fines and legal action in many countries.