In addition to investing in different industries, you can also diversify geographically, into emerging markets where the macro-level risk will be different from those in the U.S.
The fund is passively managed and has an expense ratio of a miniscule 0.08%. Vanguard rates it as having much more risk than reward, and so investors may not want to put a whole lot of their portfolio into this fund. But for the purposes of long-term growth and diversification, it could still be a good option.
Those are big names but collectively, the fund holds more than 3,600 stocks so no single one is going to heavily impact the ETF. The largest 10 holdings account for just 10.5% of is total assets as of the end of September.