Laser diffraction is a technique used to measure the size and distribution of particles in a sample. When a coherent light source, like a laser, passes through or around particles, it creates a pattern of light and dark regions known as a diffraction pattern. The angles and intensities of these patterns can be analyzed to determine the size of the particles. This method is widely used in various fields, including pharmaceuticals, food science, and environmental monitoring. It provides quick and accurate results, making it a valuable tool for researchers and industries that need to analyze particle sizes efficiently.