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Day 9/28 365, follow for more such content . . An index is a data structure used to speed up data retrieval from a table. 👉 Think of it like an index in a book: Instead of reading every page, you directly jump to the required page. 🔍 Why do we use Indexes? Faster SELECT queries Reduces full table scans Improves performance on large tables ⚠️ But: Slightly slows down INSERT, UPDATE, DELETE Uses extra storage 🧠 How does it work internally? Most DBs use B-Tree (or B Tree) Index stores sorted col