Is it true that there is animal fat in butter?

Yes, there is animal fat in butter. Butter is a dairy product derived from the milk of a mammal (usually a cow, but goat, sheep, camel and yak butter is made in various regions of the world) and consists of the cream (the part of separated milk that contains the milk fats, proteins and sugars) that has been processed via churning and (usually) the addition of salt to stabilize the butter and help delay bacterial growth within the butter.