Inequality is an important topic in mathematics. A mathematical inequality represents the relationship between two expressions based on the inequality symbol. It represents the comparative size of two given values with respect to each other. The inequality symbols are:

- Not equal to (≠)
- Less than (<)
- Greater than (>)
- Less than equal to (≤) and
- Greater than equal to (≥)

Example: To show 6 is unequal to 2, it can be shown as 6 ≠ 2.