This is a behavioural question. Here the interviewer assesses your interests and your desire to join the company. Your ANSWER must clearly depict what motivates you in working at Commvault. 

A SAMPLE answer to this COULD be like this: “I have always been fascinated by data. Since Commvault focuses on data BACKUP and recovery, I feel that I will be highly enthusiastic while working here. I am hopeful of a steep learning CURVE at Commvault and I strongly believe that this will give a boost to my career. Besides, I have interacted with a few people working at Commvault. They are extremely happy with their job. All of these motivate me to join Commvault.”