There are plenty of exchange-traded funds (ETFs) available to Australian investors, but some offer particularly interesting opportunities for the years ahead.
I've been looking at three Betashares ETFs that provide exposure to different parts of the share market.
Could they be worth buying today?
Here's what I think.

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Betashares Nasdaq 100 ETF (ASX: NDQ)
One of the reasons I like the NDQ ETF is that it provides investors with exposure to businesses changing how people live and work.
Think about how much time we spend using digital services, shopping online, watching streaming platforms, and relying on increasingly sophisticated technology.
Many of the companies behind these activities are included in the NASDAQ-100 Index (NASDAQ: NDX), which this Betashares ETF tracks.
And I think there are plenty of reasons to expect these businesses to keep growing.
Artificial intelligence (AI) is creating new opportunities for companies involved in cloud computing, semiconductors, and software. Meanwhile, digital advertising, e-commerce, and other online services continue to play important roles in the global economy.
Of course, valuations can be demanding in this area of the market, and the fund's concentration in large US technology-related companies creates additional risk. Nevertheless, I would be happy buying the NDQ ETF for the long term.
Betashares Australia 200 ETF (ASX: A200)
The next Betashares ETF I would buy takes us much closer to home.
The A200 ETF tracks an index of 200 of Australia's largest listed companies, providing investors with broad exposure to the local share market.
What I like about this fund is that Australian businesses can offer something quite different from the technology-heavy US market.
Banks, mining companies, supermarkets, and healthcare providers all play important roles in the Australian economy. And many have established businesses capable of generating profits and paying dividends through different economic conditions.
I think the income potential is also attractive for investors who want regular cash returns alongside long-term capital growth.
There is considerable exposure to banks and resources, so I would still want international investments alongside it. But I think the A200 ETF is an excellent option for building Australian share market exposure.
Betashares India Quality ETF (ASX: IIND)
The third Betashares ETF I would consider buying is the IIND ETF.
India is one of the markets I'm especially interested in over the next decade. Its expanding middle class, growing financial services industry, and continued investment in infrastructure could create significant opportunities for businesses operating there.
For example, as more people enter the formal banking system and businesses adopt digital services, companies providing those products could enjoy growing demand.
The IIND ETF provides exposure to Indian companies selected using financial quality measures.
I like that approach because strong profitability and financial health could be important when investing in a rapidly developing economy.
Overall, I think the country's long-term economic prospects make the Betashares India Quality ETF a compelling investment to consider.
Foolish takeaway
I would rate all three Betashares ETFs as buys for Australian investors with a long investment horizon.
I like how they provide access to established US businesses, the Australian share market, and India's growing economy.
There will no doubt be periods when one market performs better than the others. But I think owning businesses across these regions could be a sensible way to participate in several long-term growth opportunities.