Explanation:

Solution:
A solution is a homogeneous mixture of two or more substances. In a solution, the solute is dispersed in the solvent and the particles are evenly distributed throughout the mixture. When a liquid and a solid are combined to form a single phase, it is known as a solution.

Single Phase:
In a solution, the components are mixed at a molecular level and cannot be visually distinguished. This results in a single phase where the liquid and solid appear as a uniform mixture.

Homogeneous Mixture:
Since the liquid and solid form a single phase, they are considered a homogeneous mixture. This means that the composition is uniform throughout the solution.

Examples:
Examples of solutions include salt dissolved in water, sugar dissolved in tea, or alcohol dissolved in water. In each of these cases, the liquid and solid combine to form a single phase solution.

Characteristics:
Solutions have certain characteristics such as being transparent, not settling on standing, and passing through filter paper without leaving a residue. These properties help distinguish solutions from other types of mixtures.
In conclusion, when a liquid and a solid are combined to form a single phase mixture, it is known as a solution. Solutions are important in various fields such as chemistry, biology, and industry due to their uniform composition and properties.

Solute + solvent = solution
(solid) + (liquid) = (mixture)