Fermented milk items or aged dairy items, otherwise called refined dairy nourishments, refined dairy items, or refined milk items, are dairy nourishments that have been aged with lactic corrosive microscopic organisms, for example, Lactobacillus, Lactococcus, and Leuconostoc. The maturation procedure builds the time span of usability of the item while upgrading its taste and improving the absorbability of its milk. There is proof that matured milk items have been delivered since around 10,000 BC.[1] A scope of various Lactobacilli strains has been developed in research facilities considering many refined milk items with various flavors and attributes.