Market capitalization, or "market cap" for short, is the total value of a publicly traded company's outstanding shares of stock. It's calculated by multiplying the current stock price by the total number of shares outstanding. It's a useful metric for comparing the size of different companies, as well as for understanding a company's overall value in the market.

A high market cap indicates a company is generally viewed as financially strong and successful, while a low market cap can indicate the company is struggling or is a smaller player in the market. It's important to note that market cap can fluctuate significantly over time and is not necessarily an indication of a company's long-term financial health.