What type of fat is typically not kosher due to its animal origins?

Tallow is a type of fat derived from animal sources, specifically from the fat of cattle or sheep. According to kosher dietary laws, any food product derived from non-kosher animals or not processed in a kosher manner is considered non-kosher. Since tallow comes directly from these animals, it does not meet kosher standards unless sourced from animals that have been slaughtered according to Jewish law.

In contrast, monoglycerides can be derived from both animal and plant fats, but they often come from plant sources, making them potentially kosher depending on their source. Vegan butter is made entirely from plant ingredients and therefore is always considered kosher. Vegetable oil, being derived from plants, is also kosher. This distinction highlights why tallow is the correct answer, as it is the only option that typically fails to meet kosher criteria due to its animal origins.