Cell culture is a laboratory technique 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. Cells can be derived from various sources, including animals, plants, or microorganisms, and are typically grown in a nutrient-rich medium. Researchers use cell culture for various applications, such as drug testing, genetic research, and vaccine development. By observing how cells respond to different conditions or treatments, scientists can gain valuable insights into cellular functions and disease mechanisms, ultimately contributing to advancements in medicine and biotechnology.