There is more than one major Nasdaq index: the Nasdaq-100 and the Nasdaq Composite. The one you hear the most about is the Nasdaq-100. It is tracked by a famous ETF, QQQ. QQQ is provided by Invesco, not by Vanguard. Fidelity offers an ETF, ticker ONEQ, that tracks the Nasdaq Composite.
Vanguard offers an ETF, VGT, which tracks an index of the information technology sector, i.e. it is a pure tech ETF, including almost every technology stock, and not including any that are not classified as technology.
Fidelity, Schwab, and Vanguard operate brokerages. In these brokerages, you can buy most ETFs from most providers. You can buy QQQ or ONEQ or VGT at any of them. In other words, Vanguard-the-brokerage offers ETFs that track the Nasdaq-100 and Nasdaq Composite indexes, but Vanguard-the-fund-company doesn't offer one of its own.
QQQ is often thought of a a tech ETF, but it is only about half tech. QQQ includes stocks in many non-techy companies like Costco, PepsiCo, and Starbucks. The partial coverage of tech works both ways: QQQ is only about half tech, and about only about a third of all tech stocks are in QQQ.
In general--and I am speaking as a Vanguard fan--nowadays there is not a lot of difference between index ETFs from Vanguard or from anyone else, it's entirely a question of finding the ETF that matches what you want to hold.
I honestly think it's silly to hold QQQ, because the stocks in QQQ are not really selected in any consistent or logical way. It's all a matter of accidents of history. The Nasdaq was once a less-prestigious, less-reputable exchange than the NYSE, and they charged less and made it easier to get listed. In 1990s many tech startups chose to list on the Nasdaq for that very reason. It became tech-heavy just as tech was booming, so it looked great.
In addition to being tech-heavy, it's also more volatile than the S&P 500, so when it goes up, it goes up more than the S&P 500 but when it goes down. Naturally QQQ looked fantastic during the tech bubble, and naturally QQQ crashed catastrophically when tech crashed, losing -80% of its value in 2000-2002. If you want to invest in the Nasdaq-100, go ahead, but be aware of its total history, not just its recent history. Its performance has just been compensation for taking more risk, nothing more than that. This is shown in the numbers for Sharpe and Sortino ratios, which are measures of risk-adjusted return.
Annual income twenty pounds, annual expenditure nineteen nineteen and six, result happiness; Annual income twenty pounds, annual expenditure twenty pounds ought and six, result misery.
