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The record of all Bitcoin transactions that these computers are constantly updating is known as the blockchain.

Criminals have taken to Bitcoin because anyone can open a Bitcoin address and start sending and receiving Bitcoins without giving a name or identity. There is no central authority that could collect this information.

Bitcoin first took off in 2011 after drug dealers began taking payments in Bitcoin on the black-market website known as the Silk Road. Although the Silk Road was shut down in 2013, similar sites have popped up to replace it.

More recently, Bitcoin has become a method for making ransom payments for example, when your computer is taken over by so-called ransomware.

The records of the Bitcoin network, including all balances and transactions, are stored on every computer helping to maintain the network about 9,500 computers in late 2017.

If the government made it illegal for Americans to participate in this network, the computers and people keeping the records in other countries would still be able to continue. The decentralized nature of Bitcoin is also one of the qualities that have made it popular with people who are suspicious of government authorities.

Anyone helping to maintain the database of all Bitcoin transactions the blockchain could change his or her own copy of the records to add more money. But if someone did that, the other computers maintaining the records would see the discrepancy, and the changes would be ignored.

Only a small percentage of all transactions on the Bitcoin network are explicitly illegal. Most transactions are people buying and selling Bitcoins on exchanges, speculating on future prices. A whole world of high-frequency traders has sprung up around Bitcoin.

People in countries with high inflation, like Argentina and Venezuela, have bought Bitcoin with their local currency to avoid losing their savings to inflation.

One of the most popular business plans is to use Bitcoin to move money over international borders. Large international money transfers can take weeks when they go through banks, while millions of dollars of Bitcoin can be moved in minutes. So far, though, these practical applications of Bitcoin have been slow to take off.

There are companies in most countries that will sell you Bitcoins in exchange for the local currency. In the United States, a company called Coinbase will link to your bank account or credit card and then sell you the coins for dollars. Opening an account with Coinbase is similar to opening a traditional bank or stock brokerage account, with lots of identity verification to satisfy the authorities.

For people who do not want to reveal their identities, services like LocalBitcoins will connect people who want to meet in person to buy and sell Bitcoins for cash, generally without any verification of identity required.

The price of Bitcoin fluctuates constantly and is determined by open-market bidding on Bitcoin exchanges, similar to the way that stock and gold prices are determined by bidding on exchanges.

Bitcoin mining refers to the process through which new Bitcoins are created and given to computers helping to maintain the network. The computers involved in Bitcoin mining are in a sort of computational race to process new transactions coming onto the network. The winner generally the person with the fastest computers gets a chunk of new Bitcoins, 12.5 of them right now. (The reward is halved every four years.)

There is generally a new winner about every 10 minutes, and there will be until there are 21 million Bitcoins in the world. At that point, no new Bitcoins will be created. This cap is expected to be reached in 2140. So far, about 16 million Bitcoin have been distributed.

Every Bitcoin in existence was created through this method and initially given to a computer helping to maintain the records. Anyone can set his or her computer to mine Bitcoin, but these days only people with specialized hardware manage to win the race.

Plenty. But these other virtual currencies do not have as many followers as Bitcoin, so they are not worth as much. As in the real world, a currency is worth only as much as the number of people willing to accept it for goods and services.

Bitcoin was introduced in 2008 by an unknown creator going by the name of Satoshi Nakamoto, who communicated only by email and social messaging. While several people have been identified as likely candidates to be Satoshi, as the creator is known in the world of Bitcoin, no one has been confirmed as the real Satoshi, and the search has gone on.

Satoshi created the original rules of the Bitcoin network and then released the software to the world in 2009. Satoshi largely disappeared from view two years later. Anyone can download and use the software, and Satoshi now has no more control over the network than anyone else using the software.

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What Is Bitcoin, and How Does It Work? - The New York Times