Bitcoin is a digital currency, or cryptocurrency, that can be used to purchase goods and services online. It is not controlled by any government or central bank, and is instead managed by a distributed network of computers. Transactions are recorded on a public ledger known as the blockchain, and are protected by strong cryptography. Bitcoin is the first decentralized digital currency, and it has gained widespread acceptance since its launch in 2009. It is used by individuals and businesses around the world as an alternative to traditional currencies, and is traded on exchanges such as Coinbase and Binance. Bitcoin is also used for online gambling, remittances, donations, and more.
the next real generation of bitcoins: secure, computable and extensible, like Litecoin, which is just an improvement on the current implementation of Bitcoin
You can use Monero to anonymize BitCoins you buy using your credit card through online exchanges (see how to do this correctly).
Fulfilling Bitcoin's original promise as "point-to-point electronic cash". Low fees and reliable confirmations.
While Dogecoin is a cryptocurrency like bitcoin, it is not worth as much, and is not accepted on as many trading sites.
Ethereum
Monero
Litecoin
Bitcoin Cash
Dogecoin
Duniter
NameCoin
DASH
Ripple
Peercoin
Stellar
FairCoin
Zcoin
decRED
NXT
Vertcoin
Golem
Stellite
Anoncoin
Monero transactions cannot be tracked at all, while Bitcoin transactions can be tracked with minimal effort.