Bitcoin:

Founded in 2009, Bitcoin was the first cryptocurrency and continues to be the most traded. The coin was developed by Satoshi Nakamoto, who is believed to be a pseudonym for an individual or group of people whose exact identity remains unknown.

Ethereum:

Developed in 2015, Ethereum is a blockchain platform with its own cryptocurrency, called Ether (ETH) or Ethereum. After Bitcoin, it is the most popular cryptocurrency.

Litecoin:

This currency is similar to bitcoin, but has evolved more quickly to develop innovations, including faster payments and processes to enable more transactions.

Ripple:

Ripple is a distributed ledger system founded in 2012. Ripple can be used to track different types of transactions, not just cryptocurrencies. The company behind the coin has worked in cooperation with several banks and financial institutions.

Non-bitcoin cryptocurrencies are collectively known as "altcoins" to distinguish them from the original.