A heterogeneous mixture is a combination of two or more substances that remain distinct and do not blend uniformly. In these mixtures, the individual components can often be seen and separated physically. Examples include a salad, where you can identify the different ingredients like lettuce, tomatoes, and cucumbers, or a mixture of sand and salt. These mixtures contrast with homogeneous mixtures, where the components are evenly distributed and cannot be easily distinguished. Heterogeneous mixtures can vary in composition and appearance, making them common in everyday life, such as in rock formations or oil and water mixtures.