The term "imperialism" is often conflated with "colonialism"; however, many scholars have argued that each has its own distinct definition. Imperialism and colonialism have been used in order to describe one's perceived superiority, domination and influence upon a person or group of people. Robert Young writes that while imperialism operates from the centre, is a state policy and is developed for ideological as well as financial reasons, colonialism is simply the development for settlement or commercial intentions. However, colonialism still includes invasion. Colonialism in modern usage also tends to imply a degree of geographic separation between the colony and the imperial power. Particularly, Edward Said distinguishes the difference between imperialism and colonialism by stating; "imperialism involved 'the practice, the theory and the attitudes of a dominating metropolitan center ruling a distant territory', while colonialism refers to the 'implanting of settlements on a distant territory.' Contiguous land empires such as the Russian or Ottoman have traditionally been excluded from discussions of colonialism, though this is beginning to change, since it is accepted that they also sent populations into the territories they ruled.