Why RPG-7 is popular?

Could you elaborate on why the RPG-7 is such a popular weapon? Is it due to its versatility in combat situations, its simplicity of use, or perhaps its affordability compared to other weapons of its kind? How does its effectiveness against armored vehicles and fortifications contribute to its widespread appeal? And what about its history and evolution – has it undergone any significant changes over time that have made it even more desirable for military and paramilitary forces around the world?