SQLite embeds in apps, browsers, and phones — no separate server process. iOSApple's mobile operating system — runs iPhone and iPad with a sandboxed app ecosystem., AndroidGoogle's open mobile operating system — the dominant platform for smartphones worldwide., FirefoxMozilla's open-source browser — championed web standards and challenged Internet Explorer's dominance., and countless desktop apps store data in `.sqlite` files. TeamsMicrosoft Teams — chat, video calls, and Office integration for workplace collaboration. use it for local caches, mobile offline sync, and tests. Example: a mobile app persisting user settings with `SELECT` and transactions without running Postgres.

SQLite made SQLStructured Query Language — the standard language for querying relational databases. available everywhere a C library could link — not just on database servers.

It is likely the most widely deployed database engine on earth, hidden inside applications.