Market capitalization refers to the total dollar market value of a company's outstanding shares. Commonly referred to as "market cap," it is calculated by multiplying a company's shares outstanding by the current market price of one share. The investment community uses this figure to determine a company's size, as opposed to using sales or total asset figures.
Using market capitalization to show the size of a company is important because company size is a basic determinant of various characteristics in which investors are interested, including risk.
source: https://www.investopedia.com/terms/m/marketcapitalization.asp
A company's market cap can be found in stock listings among other sources. If you are able to find the number of shares for the company you are researching, and what they are selling for, the market cap is easy to calculate: For example, a company with 20 million shares selling at $100 a share would have a market cap of $2 billion.
The Monetary unit for this metric is US Dollars. If the value is reported in a currency other than US dollars, be sure to convert the units to USD, and add conversion details in the comments section. The following website provides yearly average conversion rates: https://www.ofx.com/en-gb/forex-news/historical-exchange-rates/yearly-average-rates/
Include the date you found this data in the comments section, along with any calculation you did.