1. Tableau Desktop:
Tableau Desktop is data visualization software that lets you see and understand data in minutes. With other Tableau products, it comprises a complete business intelligence software solution.
2. Tableau Server:
It is more of a enterprise level Tableau software. You can publish dashboards with Tableau Desktop and share them throughout the organization with web-based Tableau server. It leverages fast databases through live connections.
3. Tableau Online:
It is a private version of tableau public which eliminates the need for the infrastructure.
4. Tableau Reader:
A free desktop application that allows you to open and view visualizations/workbooks built in Tableau Desktop. You can filter, drill down data but you cannot edit or perform any kind of interactions in it.
5. Tableau Public:
This is a free Tableau software which you can use to make visualizations with but you need to save your workbook or worksheets in the Tableau Server which can be viewed by anyone.