Some investments are built for action, others are built for patience.
I think the best exchange-traded funds (ETFs) can sit in the second category. They do not need investors to trade in and out constantly. They can simply provide broad exposure, keep costs low, and give investors a sensible way to build wealth over many years.
Two Vanguard ETFs I think are well-suited to that approach are discussed in this article.

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Vanguard MSCI Index International Shares ETF (ASX: VGS)
The VGS ETF is one of the ASX ETFs I would be happy to buy and hold for decades.
The appeal is simple. It gives investors exposure to a large basket of international shares across developed markets.
For Australian investors, I think that can be very useful. The ASX has many good businesses, but it does not provide the same depth in global software, healthcare, semiconductors, payments, consumer brands, industrials, and technology platforms.
VGS helps fill that gap. Instead of trying to pick single winners overseas, investors can own a broad slice of developed markets through a single ASX-listed ETF. That means exposure to many businesses that earn revenue across different countries, currencies, industries, and economic cycles.
I also like the way a broad ETF can change over time. The world's strongest companies today may not be the same leaders in 10 or 20 years. With an index fund, investors do not need to predict every shift. As markets evolve, the portfolio can evolve with them. I think that is a strong buy-and-hold feature.
There will still be volatility. Global share markets can fall, currency movements can affect returns, and valuations can become stretched. But for investors with a long time horizon, I think VGS offers the kind of simple global exposure that can do a lot of quiet work in a portfolio.
Vanguard Diversified High Growth Index ETF (ASX: VDHG)
The VDHG ETF is another Vanguard ETF I think can suit long-term investors.
This fund is different because it is more of an all-in-one investment. It gives investors exposure to a diversified mix of assets, with a strong tilt toward growth assets such as Australian and international shares.
I think that can be helpful for investors who want simplicity.
Instead of choosing several ETFs, deciding how much to allocate to each, and rebalancing over time, the Vanguard Diversified High Growth Index ETF combines a diversified strategy into a single investment.
That does not make it perfect for everyone. Some investors may prefer more control over their Australian, international, and defensive asset exposure. Others may want a pure global shares ETF instead.
But for investors who want a straightforward buy-and-hold option, the VDHG ETF has a lot of appeal.
It can help reduce the temptation to overthink every market move. Investors can add money regularly, reinvest distributions, and let the underlying portfolio do its job over time.
I think that behavioural simplicity is underrated. A good investment plan is only useful if an investor can stick with it. This Vanguard ETF makes that easier by providing broad diversification in a single trade.
Foolish Takeaway
I think the VGS and VDHG ETFs are two of the strongest Vanguard ETFs for buy-and-hold investors.
I would buy them for long-term compounding, broad diversification, and the ability to keep investing without making the process harder than it needs to be.