Causality for Question Answering

Question Answering System automatically answers natural language questions asked by user. Promising results have been achieved for factoid-type questions but there is a need to improve non-factoid question answering. This paper has addressed the issue for automatically answering Why-type questions in Question Answering System. The concept of causality is studied and its important role for different modules in developing Why-type Question Answering System. There are various researchers who have used causality as a key component to focus on causes and effects involved in the sentences and ultimately answering Why-type Questions.