Immiscible liquids are liquids that do not mix or blend together, resulting in distinct layers when combined. Common examples include water and oil, where the two substances remain separate due to differences in their molecular structures and polarities. When immiscible liquids are poured into the same container, the denser liquid will settle at the bottom, while the lighter liquid floats on top. This separation occurs because the molecules of each liquid are more attracted to themselves than to the molecules of the other liquid, preventing them from forming a homogeneous mixture.