Db

MongoDB (Document), Cassandra (Wide-column), Redis (Key-value). C. Vector Databases

Think of a DB as a highly efficient digital library. A traditional library has shelves (storage), a card catalog (index), and a librarian (the DBMS). When you ask for a book, you don't wander the aisles aimlessly; the librarian uses the index to find the exact location instantly. Similarly, a DB allows you to (CRUD operations) data with incredible speed. a card catalog (index)