Within the category of real assets, though, investments vary significantly in terms of volatility, whether or not they offer passive income, and how closely correlated they really are with inflation.
The most common hedge against inflation is gold. Many investors flock to gold because it seems like a reliable store of value and the performance of gold is uncorrelated with the performance of the stock market.
Real estate is another real asset that can perform well in an inflationary environment. Investors with existing residential real estate can increase rents, which allows their income to stay flat or increase in real terms.