Data is the new oil, and the database is the engine that refines it into fuel.
: A single row containing all fields for one entity (e.g., one specific customer’s details). database
A database without an index is like a book without a table of contents. When you run SELECT * FROM users WHERE email = 'alice@example.com' , without an index, the database performs a —reading every single row. With a B-tree index on the email column, it reduces a 10-million-row search from seconds to milliseconds. Data is the new oil, and the database