Answer
An index speeds up data searches by avoiding full table scans. Too many indexes slow down inserts/updates due to maintenance.
Quick Answer
An index is a separate data structure that helps SQL Server find rows fast without scanning the whole table. Think of it like a book's index — instead of reading every page, you jump straight to what you need. Without indexes, every query does a full table scan.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ