Here's why:

* KOH dissociates completely in water: When KOH dissolves in water, it breaks apart into potassium ions (K+) and hydroxide ions (OH-). This complete dissociation is characteristic of strong bases.

* Hydroxide ions (OH-) are responsible for basicity: The presence of a high concentration of OH- ions in solution makes the solution strongly basic.

Let me know if you'd like more details about strong bases or how they differ from weak bases!