A dashbaord in QlikView is a document to show all different sheets with graphs, charts and other data analyses in one sheet. A dashboard helps to track the key performance indicators from the multiple data sources at the same time. It is easy to implement and saves time by accessing all the visualizations in one sheet.
If you are interested to learn QlikView, you can take up this course on QlikView Certification by Intellipaat.
You can watch this video on QlikView Tutorial to know more about the dashboard: