Cargo cults are religious movements that emerged in Melanesia during the early to mid-20th century, primarily in response to the arrival of Western colonizers and their material goods. These cults often involve the belief that ancestral spirits or deities will deliver material wealth, or 'cargo,' to the faithful, similar to what was seen with Western goods brought by colonizers. Cargo cults reflect a unique blend of traditional beliefs and the impacts of colonialism, highlighting how indigenous groups interpret and adapt their spiritual practices in light of foreign influences.