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Is Nasdaq stock an ETF?

Newb here. Is https://robinhood.com/stocks/NDAQ an ETF, aka if I buy this, is it a composite index (like QTEC)? Meaning if I buy NDAQ am I really buying a composite index, or am I just investing in ...
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Why are some stocks' movements correlated?

I noticed that stocks often go up and down together, for example I see MSFT goes up 2% and then if I look at Alphabet it's also up at around 1.5% and then if one goes down, the other goes down ...