Cell counting is a laboratory technique used to determine the number of cells in a given volume of a sample. This process is essential in various fields, including biology, medicine, and biotechnology, as it helps researchers assess cell growth, viability, and concentration. Common methods for cell counting include using a hemocytometer, an instrument that allows for manual counting under a microscope, and automated cell counters that provide quick and accurate results. Accurate cell counting is crucial for experiments involving cell cultures, drug testing, and clinical diagnostics. It ensures that the right number of cells is used in experiments, which can affect the outcomes and interpretations of research. By understanding cell populations, scientists can make informed decisions in their studies and applications.