1) Historians have debated the origins and aims of imperialism, discussing whether it was driven by economic or strategic factors, whether it was accidental or planned, and whether the goal was civilizing other peoples or self-interested exploitation.
2) Definitions of imperialism include political domination, economic exploitation, military subjugation, and the colonization of territories by settlers, but it can also refer more broadly to the growth and maintenance of an empire's power and influence.
3) While colonization involves the transfer of populations as permanent settlers, imperialism refers more to the exercise of power and control over other countries through various direct and indirect means.