What is Bitcoin?
Bitcoin is a payment system introduced as open-source software in 2009 by developer Satoshi Nakamoto. The payments in the system are recorded in a public ledger using its own unit of account, which is also called bitcoin. Payments work peer-to-peer without a central repository or single administrator, which has led the US Treasury to call bitcoin a decentralized virtual currency. Although its status as a currency is disputed, media reports often refer to bitcoin as a cryptocurrency or digital currency.

What is a Bitcoin Faucet?
Bitcoin faucets are a reward system, in the form of a website or app, that dispenses rewards in the form of a satoshi, which is a hundredth of a millionth BTC, for visitors to claim in exchange for completing a captcha or task as described by the website..

Rewards are dispensed at various predetermined intervals of time. Faucets usually give fractions of a bitcoin, but the amount will typically fluctuate according to the value of bitcoin. Typical payout per transaction is less than 1000 satoshi, although some faucets also have random larger rewards. To reduce mining fees, faucets normally save up these small individual payments in their own ledgers, which then add up to make a larger payment that is sent to a user's bitcoin address.

What are the Bitcoin Faucet's Purposes?
To introduce users to bitcoin: Faucets are a great way to help introduce new people to bitcoin, or to alternative altcoins. A majority of faucets provide information to new users as well as offering them some free coins so that they can ‘try before they buy’, experimenting with a test transaction or two before putting real money on the line. Since this whole experience is so new and a bit complicated to people, who perhaps don’t quite trust it with their hard money, this is a beneficial way to promote digital currency and bring in new users.

To get traffic: Faucets are high traffic websites. It is not all that difficult to get a huge number of page views per day to a site which is giving away free money. If a website has other content or services to promote to Bitcoin users, especially new users, a faucet is a great way to bring them to make them familiar with a brand name.