Particle characterization is the study of analyzing and measuring the physical and chemical properties of individual particles or particle systems. This includes determining the size, shape, surface area, composition, and other relevant characteristics of particles in a sample. Particle characterization is important in various fields such as pharmaceuticals, materials science, environmental science, and nanotechnology, as it helps researchers understand and control the behavior and interactions of particles in different applications. Several techniques are used for particle characterization, such as microscopy, laser diffraction, dynamic light scattering, and surface area analysis.