A substance that is dissolved in a solvent is called a solute.
In a solution, the solute is the component that gets dissolved, while the solvent is the substance that does the dissolving. For example, when you mix sugar in water, the sugar is the solute and water is the solvent. The resulting mixture is called a solution.
The process of dissolving involves the interactions between the molecules of the solute and solvent, which can lead to a uniform distribution of the solute within the solvent. Understanding the concept of solute and solvent is fundamental in chemistry and helps explain how various substances interact in different environments.