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Bitcoin showed up in 2009 as a single, slightly eccentric experiment. Sixteen years later, listing sites track millions of tokens across hundreds of blockchains, and the word "cryptocurrency" covers everything from digital gold to a joke coin named after a dog. Comparing them all head to head is like comparing a savings account to a lottery ticket to a plumbing business. The categories are what make the space legible.
A coin runs on its own blockchain. Bitcoin, Ether and Solana are coins: each has its own network, its own miners or validators, and its own rules about how new units are created.
A token is built on top of somebody else's chain. USDC started life as a token on Ethereum. Chainlink's LINK is a token. Most of the tens of thousands of things you see listed on exchanges are tokens, and that matters because tokens inherit both the strengths and the bottlenecks of the chain underneath them. If you want the mechanics in more depth, this explainer on what digital money really is and what it isn't is a decent place to start.
Bitcoin was designed around one idea: a fixed supply. There will never be more than 21 million BTC, and new coins enter circulation on a schedule that halves roughly every four years (every 210,000 blocks, to be precise). Miners spend electricity to secure the network and are paid in newly issued bitcoin plus transaction fees.
That supply cap is why so many people treat BTC as a long-term holding rather than a payment method. If the mining side of this is fuzzy, our walkthrough of the ledger, the keys and the miners covers how transactions actually get confirmed.
A handful of other coins follow a similar template. Litecoin launched in 2011 with faster blocks and a larger supply. Bitcoin Cash split off in 2017 after a fight over block size, betting that cheaper payments would win. Both have loyal followings and far smaller market caps than the original.
Ethereum, live since 2015, added a second layer to the idea: a blockchain that can run code. Developers deploy programs called smart contracts, and those contracts can hold money, swap assets, issue loans or mint entirely new tokens. Ether (ETH) pays for the computing power required, which is why fees on busy days have historically spiked into the tens of dollars per transaction.
Ethereum switched from mining to staking in September 2022, cutting its energy use by more than 99%. It also faces real competition. Solana trades some decentralisation for speed and low fees. BNB Chain, Avalanche and Cardano occupy similar ground. Layer-2 networks such as Arbitrum, Optimism and Base now handle a large share of Ethereum activity off the main chain and settle back to it.
Stablecoins are pegged to something boring, usually the US dollar, and that is the point. They let traders move value between exchanges without touching a bank, and they let people in countries with unreliable currencies hold dollar exposure from a phone.
That collapse is worth remembering whenever a stablecoin promises a yield as well as a peg. A dollar is a dollar until it isn't.
Plenty of tokens exist to unlock something rather than to be money. Chainlink's LINK pays node operators for feeding real-world data into contracts. Uniswap's UNI and Aave's AAVE give holders voting rights over how those protocols are run and how fees are allocated. Exchange tokens such as BNB offer trading fee discounts and access to token sales.
The honest test for any of these is simple: what does the token do that the platform could not do without it? If the answer is vague, the token is probably a fundraising instrument with a logo.
Dogecoin started in 2013 as a joke about the Shiba Inu meme and now sits among the largest digital assets by market value. Shiba Inu followed in 2020, and 2024 brought a wave of Solana-based tokens launched in minutes through platforms like pump.fun.
There is no cash flow here, no revenue, no product. Price comes down to attention and the willingness of the next buyer to pay more. Some traders do well. A much larger number buy near the top of a viral moment and hold a position with almost no liquidity underneath it. If you are going to play, size it like a lottery ticket and know how you'll get out, which is the whole subject of selling without leaving money on the table.
Monero hides sender, receiver and amount using ring signatures and stealth addresses. Zcash offers optional shielded transactions built on zero-knowledge proofs. Both do something Bitcoin does not: make ordinary transactions genuinely hard to trace.
The trade-off is regulatory. Binance delisted Monero in early 2024, and several other venues have followed, citing compliance concerns. Privacy coins are a real category with real users, but they come with thinner liquidity and a higher chance of being removed from your exchange while you hold them.
Category labels tell you roughly what game you're playing. They don't tell you whether the specific coin in front of you is any good. Four things are worth checking first.
Once you've picked a few candidates, the practical side takes over: where to buy, what the spread and withdrawal fees look like, and how much you're prepared to hold through a 60% drawdown. Our guide to buying without wasting money on fees covers the mechanics, and a structured approach to investing from first purchase to exit is worth reading before you commit real capital.
The categories above are a filter, not a verdict. Bitcoin, a stablecoin and a week-old meme token are three different products with three different risk profiles, and treating them as variations on a single asset class is how people end up surprised by their own portfolio.
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