Here's a breakdown:

* Convergent Plate Margin: This occurs when two tectonic plates move towards each other.

* Continental-Continental Collision: This specific type of convergent margin happens when two continental plates collide. Because continental crust is relatively light and buoyant, it cannot subduct (slide beneath) the other plate. Instead, the immense pressure of the collision causes the crust to buckle, fold, and uplift, creating mountain ranges.

In the case of the Himalayas, the Indian subcontinent (which was once a separate landmass) collided with the Eurasian Plate. This collision began about 50 million years ago and continues today, resulting in the formation of the Himalayas and the Tibetan Plateau.