Final answer:
An expatriate is a person who lives outside of their home country, often as a foreign employee or as students and professionals temporarily residing in a different nation.
Step-by-step explanation:
An expatriate is defined as a person who lives outside their native country. This can occur in various circumstances, such as a foreign employee who moves to work in another country, which is also known as international migration. However, expatriates can be in other forms such as students known as exchange students, or professionals like sociologists conducting research abroad. They might temporarily leave their home to live in another country, thus becoming expatriates during that period.