Magnetic stirring is a laboratory technique used to mix liquids efficiently. It involves a magnetic stirrer, which consists of a rotating magnet or a magnetic field, and a stir bar placed inside the liquid. As the stirrer rotates, the stir bar spins, creating a vortex that helps to blend the contents evenly. This method is commonly used in chemistry and biology labs for tasks like dissolving substances or maintaining uniform solutions. Magnetic stirring is preferred for its ability to mix without introducing air bubbles, making it ideal for sensitive experiments where contamination must be minimized.