This rating is taken from CoinGecko, a website that provides information on the sequence of cryptocurrencies by developer, community and liquidity activities. All of these figures are accurate at the end of August 2018 namely Bitcoin
Bitcoin is the first virtual currency and all that started, this currency was released in 2009 by the creator, Sathosi Nakamoto. Bitcoin currently has the largest market capitalization to date of around $ 10 billion.
Most people usually before using the others they first use bitcoin because bitcoin has a great reputation, all other digital currencies are referred to as 'altcoins' (alternative coins because they are alternatives to Bitcoin).
Bitcoin is known for being the first, the easiest to get, and the widest revenue.