When is the wine Kosher?

Kosher wine (Hebrew: יין כשר, yayin kashér) is wine produced according to Judaism's religious law, specifically, the Jewish dietary laws regarding wine. However, some non-Orthodox branches of Judaism are more "lenient" with these laws. Reform Judaism as well does not usually observe these laws, however, it is common for many synagogues or individuals from those traditions to use yain kasherproducts.