Cell fusion is a biological process where two or more cells combine to form a single cell with a shared cytoplasm and genetic material. This can occur naturally, such as in the formation of muscle fibers, or be induced artificially in laboratory settings for research purposes. In research, scientists often use cell fusion to create hybrid cells, which can help study specific functions or produce valuable substances like antibodies. This technique is important in fields like genetics, immunology, and biotechnology, as it allows for the exploration of cellular behaviors and the development of new therapies.