Most OpenStreetMap-based maps you see these days on the Internet are only updated every so often. Some may be updated daily, most are probably only updated every few weeks or months. And that is totally okay for most use cases. But there are some maps that are updated continuously so that changes in the OSM data appear as fast as possible, which is important to motivate OSM contributors and helps with quickly detecting and fixing problems. The most important map with continuous updates is the main map you see on www.openstreetmap.org.