What is a convergent boundary

A convergent boundary is an area where 2 or more plates collide. 1 plate slides underneath the other causing subduction.

a tectonic boundary where two plates are moving toward each other.

Explanation:

A convergent boundary is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other causing a process known as subduction. The subduction zone can be defined by a plane where many earthquakes occur, called the Benioff Zone.