What is it called when two plates collide causing crust to deform but don't break?

When two tectonic plates collide and deform the crust without breaking, this process is called "ductile deformation" or "ductile failure." This occurs in regions where the pressure and temperature are high enough to allow the rocks to bend and flow rather than fracture. Such interactions often happen at convergent plate boundaries, leading to the formation of mountain ranges and other geological features.