Tableau is a leading business intelligence and data visualization platform that enables users to connect to data sources, create interactive dashboards, and share insights. Built on a drag-and-drop interface, it democratizes data analytics by allowing non-technical users to create sophisticated visualizations without writing code. At its core, Tableau operates on a visual query language called VizQL that automatically translates user interactions into database queries. One critical concept to grasp early: Tableau distinguishes between dimensions (categorical data that creates structure) and measures (numeric data that gets aggregated), and understanding this distinction fundamentally shapes how your visualizations behave and what calculations you can build.

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