Gross Domestic Product (GDP) is the total monetary value of all goods and services produced within a country's borders in a given period of time, usually a year. It is used as an indicator of a country's economic performance and is often used to compare the economic growth of different countries. GDP can be calculated by adding up the value of all final goods and services produced in a country, including consumer goods, government services, and investments. It is an important measure of a country's economic health, but it does not take into account factors such as income inequality, environmental impact, and social welfare.