100,000,000,000 XRP were created at the outset of the network, by its founders, and portion of those were gifted to Ripple Labs. Here is an explanation of why that total specific number of XRP units was chosen. No new XRP can ever be created, and the total supply constantly decreases---as small portion of XRP are destroyed with every transaction.

Many have been confused on this topic, due to how Ripple is represented on sites like coinmarketcap.com. Available supply has increased over time, as Ripple Labs continues to distribute its XRP holdings, but total supply has only ever decreased. Calculating market capitalization according to available supply of XRP is in some ways similar to calculating Bitcoin market cap according to mined Bitcoins, as opposed to the total number that will ever be mined. Initially, coinmarketcap.com calculated XRP market cap according to total supply and received criticism that the number was misleading, since it did not represent the total number of XRP potentially available at market.