XRP is a digital currency forming a part of the Ripple system, created by Ripple Labs.
XRP is not competition for the famous crypto currencies, such as Bitcoin or Litecoin, as they were created as an alternative to traditional money, while Ripple is a kind of banking system with a dedicated currency.
XRP is issued by Ripple Labs. The total number of XRP is 100 Billion units, each XPR unit being divided into 1 milllion parts called 'drops'.
XRP price changes are based on the supply and demand at the EXMO exchange. Ripple Labs, however, can also interfere while the exchange rate is being changed; as such, XRP is centralized and being regulated.