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Excel Power Query is Excel's built-in data preparation and transformation tool that helps users collect, clean, combine, and reshape data from multiple sources without writing complex formulas or macros. It enables users to automate repetitive data-cleaning tasks and create repeatable workflows that can be refreshed with a single click. Power Query can connect to various data sources such as Excel files, CSV files, databases, web pages, and folders. Users can perform tasks such as removing duplicates, splitting columns, merging datasets, handling missing values, unpivoting data, and standardizing formats before analysis. By reducing manual effort and improving data accuracy, Power Query serves as an essential tool for reporting, dashboard development, business analytics, and data-driven decision-making. It is particularly valuable for finance, sales, operations, HR, and management professionals who regularly work with large volumes of data.