In Tableau, dimensions and measures are used to organize and analyze data in a data source. Dimensions are fields that contain categorical data, such as names, descriptions, or labels. Measures are fields that contain numerical data, such as quantities, amounts, or ratios.

Dimensions are often used to slice and filter data, and to provide context for measures. For example, you might use a dimension such as “Product Category” to filter a visualization by specific product categories, or to group measure values by category.

Measures are often used to perform calculations and aggregations, and to create charts and other visualizations. For example, you might use a measure such as “Sales” to calculate the total sales for a specific period, or to create a bar chart that shows sales by product category.

In Tableau, dimensions and measures are represented by different icons in the data pane, and they can be used in different ways in charts and visualizations. For example, dimensions are typically placed on the axes of a chart, while measures are typically used as the values or marks in a chart.

I hope this helps to give you an understanding of the differences between dimensions and measures in Tableau!