SQLite
SQLite is a lightweight, serverless, self-contained, and zero-configuration relational database management system (RDBMS) that stores data in a single file on disk. It is widely used for embedded systems, mobile applications, and desktop software due to its simplicity, reliability, and minimal resource requirements. Unlike client-server databases, SQLite operates directly on the database file without requiring a separate server process.
Developers should learn and use SQLite when building applications that need a local, persistent data store without the overhead of a full database server, such as mobile apps (e.g., iOS/Android), IoT devices, or small-scale desktop tools. It is ideal for scenarios requiring portability, low latency, and ease of deployment, as it supports ACID transactions and standard SQL queries while being cross-platform and open-source. Use cases include caching, configuration storage, and prototyping where a simple database suffices.