Lee's Push-Pull Theory is a model that explains migration patterns by identifying factors that drive individuals to leave their home country (push factors) and those that attract them to a new location (pull factors). This theory highlights how certain conditions, such as economic hardship or conflict in the home country, can compel people to migrate, while opportunities for better jobs or living conditions in another country can draw them in. Understanding this theory helps to differentiate between forced and voluntary migration, as well as to assess the broader impacts of migration on both sending and receiving regions.