Google Maps

Google Maps is simply the most comprehensive mapping and navigation product ever built, and its dominance is well-earned. Coverage across 220+ countries with real-time traffic, Street View, transit directions, and business information creates an all-in-one location platform that nothing else matches in breadth. The data quality is exceptional -- turn-by-turn navigation is reliable, business listings are comprehensive, and real-time traffic rerouting genuinely saves time. Offline maps for areas with poor connectivity and indoor maps for airports and malls show attention to real-world use cases. The immersive 3D views and fuel-efficient routing are thoughtful recent additions. As a travel companion, business listings with reviews, photos, and hours make local discovery easy in unfamiliar cities. The API powers countless third-party applications. The only meaningful criticisms are privacy-related -- Google's location data collection is extensive -- and occasional navigation errors in rapidly changing areas. With 10 billion downloads, Google Maps has achieved essential-app status for good reason.