An S3DB file is a database file used by SQLite, a self-contained, serverless, zero-configuration, transactional SQL database engine. S3DB files store structured data in tables, similar to other database systems like MySQL or PostgreSQL, but SQLite databases are stored in a single file, making them highly portable and easy to manage. They are commonly used in embedded systems, mobile applications, and desktop software where a lightweight and easily deployable database solution is required. The S3DB format is the standard file extension for SQLite 3 databases, although other extensions like .sqlite and .db are also frequently used. SQLite is known for its reliability, performance, and small footprint, making it a popular choice for a wide range of applications. Data within an S3DB file can be accessed and manipulated using SQL queries, allowing developers to create, read, update, and delete data efficiently. The format supports various data types, including text, integers, floating-point numbers, and BLOBs (Binary Large Objects).