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What is a database?

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Quick answer

A database is an organized collection of information stored so a computer can quickly find, add, and update it. From your bank balance to a shopping app's product list, databases are the structured memory behind almost every app and website.

Key things to understand

  1. An organized store of information a computer can search fast.
  2. Data is arranged in tables, documents, or keys.
  3. Apps read from and write to it constantly.
  4. A query language like SQL retrieves exactly what's needed.

People also ask

What is a database used for?
To store and quickly retrieve structured information — user accounts, transactions, messages, products, and almost any app data.
What is SQL?
SQL (Structured Query Language) is the standard language for asking a database to find, add, change, or delete specific data.
What's the difference between SQL and NoSQL databases?
SQL databases store data in strict related tables; NoSQL databases trade some structure for flexibility and scale.
Why do apps need a database?
To reliably store, organize, and retrieve information — accounts, posts, orders — even with millions of users.