【中文版】

GDP是国民生产总值的缩写，它是指一个国家或地区在一定时期内所有常住单位的生产活动的最终成果。GDP是国民经济核算的核心指标，也是衡量一个国家或地区经济状况和发展水平的重要指标。

GDP可以通过生产法、收入法和支出法进行计算。生产法是从生产过程中生产的货物和服务总产品价值入手，剔除生产过程中投入的中间产品的价值，得到增加值的价值总额。收入法也称分配法，是从生产过程创造收入的角度，对常驻单位的生产活动成果进行计算。支出法也称最终消费法，是从最终使用的角度反映经济产出的方法。

GDP具有重要意义，它反映了国家的经济实力和市场规模，是制定国家经济政策和进行宏观调控的重要依据。同时，GDP也是国际上比较国家经济实力的重要指标。

总的来说，GDP是国民经济核算的核心指标，是衡量一个国家或地区经济状况和发展水平的重要指标，具有重要意义。

【英文版】

GDP, which stands for Gross Domestic Product, is the total value of all goods and services produced within a country or region in a certain period of time. GDP is the core indicator of national economic accounting and an important measure to assess the economic status and development level of a country or region.

There are three ways to calculate GDP: production method, income method and expenditure method. The production method calculates the total value of goods and services produced by removing the value of intermediate products used in the production process. The income method calculates the results of production activities of resident units from the perspective of income creation in the production process. The expenditure method calculates the economic output from the perspective of final use.

GDP is of great significance as it reflects the economic strength and market size of a country, and is an important basis for formulating national economic policies and conducting macroeconomic regulation. At the same time, GDP is also an important indicator for comparing the economic strength of countries internationally.

In summary, GDP is the core indicator of national economic accounting and an important measure to assess the economic status and development level of a country or region, which has great significance.