Define:
Isotonic Solution

Explanation

### Step-by-Step Solution:

1. **Understanding Solutions**: A solution is a homogeneous mixture composed of two components: a solute and a solvent. The solute is the substance that is dissolved, while the solvent is the substance that does the dissolving.

2. **Defining Concentration**: Concentration refers to the amount of solute present in a given volume of solvent. It can be described as the ratio of solute to solvent.

3. **Types of Solutions**: Solutions can be classified based on the concentration of solute relative to the solvent. The three main types are:
- **Hypotonic Solution**: Contains a lower concentration of solute compared to the solvent.
...