Smuggling refers to the act of secretly transporting or hiding something, usually goods or people, in order to avoid paying taxes, customs duties or other legal restrictions. It is often done illegally and involves moving contraband items across borders without declaring them to authorities. Smugglers may use various methods such as concealing the items in their clothing or luggage, hiding them in vehicles or shipping containers, or using fake documents to avoid detection. The term can also refer to the act of transporting someone or something illegally across a border for personal gain.