What do you understand by Trade facilitation of WTO? What is the view of developing countries on trade facilitation?

What do you understand by Trade facilitation of WTO? What is the view of developing countries on trade facilitation? (GS 2)

विश्व व्यापार संगठन के व्यापार सुविधा से आप क्या समझते हैं? विकासशील देशों की इसपर क्या राय है?