A database is a structured collection of data stored electronically and managed by a Database Management System (DBMS). Databases can be relational (SQL-based, using tables with rows and columns) or non-relational (NoSQL, using documents, key-value pairs, or graphs). They support operations like creating, reading, updating, and deleting data (CRUD).
Every meaningful application needs to persist and query data. Choosing the right database (relational vs. NoSQL, managed vs. self-hosted) directly impacts application performance, scalability, and development speed. Understanding database fundamentals is critical for building reliable, data-driven software.
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