Cash. Money has a set value and is considered like for like in a value transaction. Of course, a very small percentage of money is also collectible, but that doesn't make it not fungible if a person was willing to take that misprinted dollar or mis-stamped coin to the bank and deposit it into their account.
Stocks. Shares of companies of the same class are identical and can be swapped without any fuss. There's not a single common stock that's any different from another. They all offer the same value, the same benefits, and the same percentage of ownership. This also goes for shares of exchange-traded funds (ETFs) and similar investments.
Bonds. Like stocks, all bonds of the same issue and maturity date are considered to be the same and can be traded, even if you may find them listed for different prices on a secondary market. The face value and coupon rate of each bond are the same, so their actual value is the same. This sameness makes them fungible.
Cryptocurrency. Crypto is a funny thing, and I'm sure we've all heard plenty about it in the last few years, but it's important to note that cryptocurrencies are fungible. Like stocks and bonds, each digital coin is worth the exact same amount; they're identical in function, and they're indistinguishable, value-wise. Not everything in the crypto world is fungible, but cryptocurrency is, just like paper money.
Fungible versus non-fungible
Something that's fungible is fundamentally the same in all the ways that count. Generally speaking, it has similar characteristics that make it worth the same amount to anyone who might be interested in the item, and almost no one will be ruffled if you swap a dollar, bond certificate, stock, or Bitcoin for another.
Non-fungible items, on the other hand, are sometimes very different from one another, and these unique characteristics give them unique values. A good example is real estate. Even in an empty field being developed for building lots, each lot is different and has different characteristics. Some are closer to the main road than others; some will be closer to fire hydrants, or get more sun, or maybe even have a few trees that the others don't. They're never identical. They're non-fungible and cannot be directly swapped because they are not functionally the same.
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