Cryptocurrency, sometimes known as "crypto," is a digital currency, like Bitcoin, that is used as a speculative investment or as an alternative payment mechanism. The term "cryptocurrency" refers to the cryptographic methods that enable safe transactions without the involvement of a central bank or government.
Here are a few examples:
Bitcoin was initially developed primarily to be a form of payment that isn't controlled or distributed by a central bank. While financial institutions have traditionally been necessary to verify that a payment has been processed successfully, Bitcoin accomplishes this securely, without that central authority.
Ethereum uses the same underlying technology as Bitcoin, but instead of strictly peer-to-peer payments, the cryptocurrency is used to pay for transactions on the Ethereum network. This network, built on the Ethereum blockchain, enables entire financial ecosystems to operate without a central authority. To visualize this, think insurance without the insurance company, or real estate titling without the title company.
Scores of altcoins (broadly defined as any cryptocurrency other than Bitcoin) arose to capitalize on the various — and at times promising — use cases for blockchain technology.
Meme coins, a subcategory of altcoins, are joke cryptocurrencies that represent internet memes. Some meme coins, such as Dogecoin, have risen to substantial market caps, despite having no serious use cases.
Stablecoins have been around for years, but recently rose to the fore with the passage of the GENIUS Act. Stablecoin values aren't meant to fluctuate; rather, they're pegged to real-world assets, like the U.S. dollar. They're meant to deliver many of the benefits of digital assets without the unpredictable and large swings in value.
People invest in cryptocurrencies for the same reason anyone invests in anything. They hope its value will rise, netting them a profit.
If demand for Bitcoin grows, for example, the interplay of supply and demand could push up its value. If people began using Bitcoin for payments on a huge scale, demand for Bitcoin would go up, and in turn, its price in dollars would increase. So, if you'd purchased one Bitcoin before that increase in demand, you could theoretically sell that one Bitcoin for more U.S. dollars than you bought it for, making a profit.
The same principles apply to Ethereum. "Ether" is the cryptocurrency of the Ethereum blockchain, where developers can build decentralized finance (or "DeFi") apps without the need for a third-party financial institution. Developers must use Ether to build and run applications on Ethereum, so theoretically, the more that is built on the Ethereum blockchain, the higher the demand for Ether.
However, it's important to note that to some, cryptocurrencies aren't investments at all. Bitcoin enthusiasts, for example, hail it as a much-improved monetary system over our current one and would prefer we spend and accept it as everyday payment. One common refrain — "one Bitcoin is one Bitcoin" — underscores the view that Bitcoin shouldn't be measured in USD, but rather by the value it brings as a new monetary system.
Cryptocurrencies are supported by a technology known as blockchain, which maintains a tamper-resistant record of transactions and keeps track of who owns what. The use of blockchains addressed a problem faced by previous efforts to create purely digital currencies: preventing people from making copies of their holdings and attempting to spend it twice
Individual units of cryptocurrencies can be referred to as coins or tokens, depending on how they are used. Some are intended to be units of exchange for goods and services, others are stores of value, and some can be used to participate in specific software programs such as games and financial products.
One common way cryptocurrencies are created is through a process known as mining, which is used by Bitcoin. Bitcoin mining can be an energy-intensive process in which computers solve complex puzzles in order to verify the authenticity of transactions on the network. As a reward, the owners of those computers can receive newly created cryptocurrency. Other cryptocurrencies use different methods, such as proof of stake, to create and distribute tokens, and many have a significantly lighter environmental impact.
For most people, the easiest way to get cryptocurrency is to buy it, either from an exchange or another user.
It’s important to remember that Bitcoin is different from cryptocurrency in general. While Bitcoin is the first and most valuable cryptocurrency, the market is large — there are thousands of cryptocurrencies. And while some cryptocurrencies have total market valuations in the hundreds of billions of dollars, others are obscure and essentially worthless.
If you’re thinking about getting into cryptocurrency, it can be helpful to start with one that is commonly traded and relatively well-established in the market. These coins typically have the largest market capitalizations.
Thoughtfully selecting your cryptocurrency, however, is no guarantee of success in such a volatile space. Sometimes, an issue in the deeply interconnected crypto industry can spill out and have broad implications on asset values. For example, when crypto exchange FTX collapsed in November 2022, the price of Bitcoin fell more than 20% over the following two months.
Whether or not cryptocurrency is a security is a bit of a gray area right now. To back up a little, generally, a "security" in finance is anything that represents a value and can be traded. Stocks are securities because they represent ownership in a public company. Bonds are securities because they represent a debt owed to the bondholder. And both of these securities can be traded on public markets..
There’s no question that cryptocurrencies are legal in the U.S. Ultimately, whether they’re legal worldwide depends on each individual country.
The question of whether cryptocurrencies are legally allowed, however, is only one part of the legal question. Other things to consider include how crypto is taxed and what you can buy with cryptocurrency.
Legal tender: You might call them cryptocurrencies, but they differ from traditional currencies in one important way: there's no requirement in most places that they be accepted as "legal tender." The U.S. dollar, by contrast, must be accepted for "all debts, public and private." Countries around the world are taking various approaches to cryptocurrency. For now, only one country, El Salvador, accepts Bitcoin as legal tender. In the U.S., what you can buy with cryptocurrency depends on the preferences of the seller.
Crypto taxes: Again, the term "currency" is a bit of a red herring when it comes to taxes in the U.S. Cryptocurrencies are taxed as property, rather than currency. That means that when you sell them, you'll pay tax on the capital gains, or the difference between the price of the purchase and the sale. And if you're given crypto as payment — or as a reward for an activity such as mining — you'll be taxed on the value at the time you received it.