Monero has a semi-strict monetary policy. Whereas Bitcoin will top at 21 million bitcoins, the Monero algorithm is set to stop at 18.1 million XMR in approximately 8 years. More precisely, there will be 18.132 million coins by the end of May 2022.
After that — and here’s the difference from Bitcoin — a constant “tail emission” of 0.6 XMR per 2-minutes block will create a sub-1% perpetual inflation. This ensures that coins never run out of supply while providing incentive for miners to continue “doing their thing.”