A province is an area of land that is part of a country, similar to a state or a county. It can also be an area of land under political control by an outside country, similar to a colony. Provinces are usually units of government.
A province is a region within a country. If you travel to Canada, you'll have to decide whether you want to go to the province of Quebec, or Saskatchewan, or one of the other 8 provinces in that enormous country. Many countries are divided into provinces