A colloidal suspension is a mixture where tiny particles are dispersed throughout a fluid but do not settle at the bottom. These particles, known as colloids, are larger than molecules but smaller than what can be seen with the naked eye. Common examples include milk, fog, and paint, where the dispersed particles remain evenly distributed. In a colloidal suspension, the particles are held in place by interactions with the surrounding fluid, preventing them from clumping together or settling. This stability is crucial for many applications, such as in food products, cosmetics, and pharmaceuticals, where uniformity is essential for performance and appearance.