Animal cells are artificially cultivated in a favorable environment as part of a biotechnological approach called animal cell culture. Typically, multicellular eukaryotes and their established cell lines provide the cells needed for animal cell culture. Animal cell culture is a popular and commonly used method for isolating cells and cultivating them in sterile environments. This method was initially created as a lab procedure for specific studies, but it has now been modified to keep live cell lines isolated from their original source.