1. Bitcoin Exchanges: A bitcoin exchange is a digital marketplace where traders can buy and sell bitcoins using different fiat currencies or altcoins. Popular exchanges include Coinbase, Binance, Kraken, Bitfinex, and Gemini.
2. Peer-to-Peer (P2P) Marketplaces: These platforms offer a simple way for individuals to buy and sell cryptocurrency directly with one another, without going through a traditional exchange. Examples of P2P marketplaces are LocalBitcoins and Paxful.
3. Cryptocurrency Brokers: These are brokers that offer services similar to those of currency exchanges, but with some extra features. They usually offer more customized services, such as the ability to buy crypto with a credit card, as well as lower fees, compared to traditional exchanges. Examples of brokers are Coinmama and CEX.io.
4. Cryptocurrency ATMs: A relatively new way to buy and sell cryptocurrency is to use a Bitcoin ATM. These machines provide an easy and anonymous way to purchase cryptocurrency with cash.