Congrats on the arbitrary milestone... One of America's 3 big stock indexes, the Nasdaq, just hit the round number of 9,000 points. The Dow Jones Industrial Average and S&P 500 both aim to represent a broad industry range of US stocks — but Nasdaq is more of a tech index. And it's unique:
The times, they are a-changing... The NYSE was founded way back in 1792, when brokers got together under a tree on Wall Street. The Nasdaq exchange was founded in 1971, claiming to be more efficient than NYSE because it used computers to trade, not huge dudes who had retired from college football/lacrosse.
There's hardly any difference between NYSE & Nasdaq anymore... Both exchanges give the same key benefits: Companies can sell stock to public investors, then public investors can buy that stock. That's why some tech companies list on the NYSE (like Uber) and some non-tech companies go Nasdaq (Lululemon surged 91% on Nasdaq this year). Here are today's main differences: