Business Analysis identifies and clarifies the intent and value of making a change. A problem can't be solved if the root cause of the issue isn't completely understood. Business Analysis professionals help identify the needs of the business and solve issues.
Consider a farmer suffering from a poor crop yield. This could be due to the land being arid, poor quality of seeds, wrong choice of plantation, unfavourable weather conditions or poor quality fertilizer. Unless the root cause of the problem is identified, there can be no viable solution.