FATF defines it as the process of disguising the proceeds of crime and moving value through trade transactions in an attempt to legitimise their illicit origin. The same mechanics move value in defiance of a restriction rather than to clean it, which is why the typology literature is directly applicable to sanctions work.
The 2020 FATF and Egmont Group study found that trade-based techniques are frequently combined with corporate concealment and with informal value transfer, rather than used alone, and that detection almost always depends on reconciling documents held by different parties.