Tableau Desktop is having 3 editions: -
1) Tableau Public
2) Tableau Personal
3) Tableau Professional
for comparison check here: - Tableau Desktop Feature Comparison | Tableau Public
Is your query is about Tableau desktop in public edition?
Since Robin wrote that, Tableau has started offering other 'flavors' of Tableau Public, so not all of that is still strictly true. But the other Public options are paid options usually involving larger companies/institutions.