Web SQL Database
Web SQL Database is a deprecated web browser API that provides a client-side relational database using SQL. It allows web applications to store structured data locally in the user's browser, enabling offline functionality and faster data access. The API is based on SQLite and supports transactions, queries, and data manipulation through JavaScript.
Developers should learn Web SQL primarily for maintaining legacy web applications that still use it, as it was widely implemented in browsers like Chrome and Safari before being deprecated. It's useful for understanding client-side data storage evolution and for projects requiring simple, SQL-based local storage in older environments, though modern alternatives are recommended for new development.