A dashboard is a consolidated display of many worksheets and related information in a single place. It is used to compare and monitor a variety of data simultaneously. The different data views are displayed all at once. Dashboards are shown as tabs at the bottom of the workbook and they usually get updated with the most recent data from the data source. While creating a dashboard, we can add views from any worksheet in the workbook along with many supporting objects such as text areas, web pages, and images.
Tableau has a very wide variety of formatting options to change the appearance of the visualizations created. You can modify nearly every aspect like fonts, colors, size and layout etc. You can format both the content and containers like tables, labels of axes and workbook theme etc.