This question aims to reveal your motivation for choosing a career with them. Some candidates might compete for this position for opportunities towards their long-term career goals, because the work environment and culture feel like a good fit, or because the salary and benefits package is better than their current employer's. The interviewers need to be sure the new hires they bring onboard will contribute as much as they're willing to give and that a professional relationship with them would be symbiotic and mutually rewarding. Share your motives, expectations, and any other factors that are important to you when considering a new job.