The basic unit of community and policy remains the nation, even as relations among nations, and among individuals in different nations, become increasingly necessary and important. Globalisation refers to global economic integration of many formerly national economies into one global economy, by free trade, especially by free capital mobility, and also, as a distant but increasingly important third, by easy or uncontrolled migration. Globalisation is the effective erasure of national boundaries for economic purposes. National boundaries become totally porous with respect to goods and capital, and increasingly porous with respect to people, viewed in this context as cheap labour, or in some cases cheap human capital. In sum, globalisation is the economic integration of the globe.
Integration is the act of combining separate albeit related units into a single whole.
As the saying goes, to make an omelette you have to break eggs. The distintegration of the national egg is necessary to integrate the global omelette. This obvious logic, as well as the cost of disintegration, is frequently met with denial. We are writing the constitution of a single global economy. This is a clear affirmation of globalisation and rejection of internationalisation as just defined.