system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are NASDAQ and Dowjones 

Are they corporations or what? Every day on the local news they talk about those two and I'm not sure what their significance is.
gpt
NASDAQ is a market where stocks are sold. A stock is essentially a share of a company: if you own a stock in, say, Apple, it means you own a part of Apple, and are entitled to a percentage of their profits, depending on the percentage of total stock that you own.

Stocks are sold on different markets around the world. There are many big ones in major financial cities, such as London, New York, Tokyo, Hong Kong, etc. The NASDAQ Market is the second largest in the world behind the New York Stock Exchange (NYSE).

The Dow Jones Industrial Average (often abbreviated to just 'the DOW') is an index measuring the value of the 30 largest publicly traded companies in the United States. (To be publicly traded means that you have issued stock, and those stocks are traded on markets such as the NASDAQ, NYSE, etc).