Cell cultures are laboratory techniques used to grow and maintain cells outside their natural environment. This process allows scientists to study the behavior, growth, and characteristics of cells in a controlled setting. Cell cultures can be derived from various sources, including human, animal, or plant tissues, and are essential for research in fields like biology, medicine, and pharmacology. In a typical cell culture, cells are placed in a nutrient-rich medium that provides the necessary conditions for growth. Researchers can manipulate these cultures to test hypotheses, develop new treatments, or produce biological products, such as vaccines. This method is crucial for advancing our understanding of cellular processes and disease mechanisms.