Similarly, they are sometimes even viewed by their fellow citizens as foreigners, particularly their children, whose accents may seem strange to their classmates. The children of expatriates are often considered Third Culture Kids (or TCKs) and later in life consider themselves "Adult Third Culture Kids" (or ATCKs). These children often hold passports from multiple countries, speak several different languages, and have a hard time defining where "home" is.
The difference between an expatriate and an immigrant is that immigrants (for the most part) commit themselves to becoming a part of their country of residence, whereas expatriates are usually only temporarily placed in the host country and most of the time plan on returning to their home country, so they never adopt the culture in the host country. While Europeans or North Americans living in the Middle East and Asia may marry local people and have children, most see no advantage in adopting citizenship of their host countries, usually because they consider their stay only temporary. In countries like Saudi Arabia, expatriates are required to live in segregated compounds - integration into their host country's society is not an option. As a result a lively community of social blogs has evolved that links the different segregated communities.