If you are refering to the job title “Data Analyst” then:
The data analyst is a highly trained professional who performs the analysis, running various mathematical calculations to determine how the data samples might best be applied to profit the business.
Most importantly, the data analyst evaluates risk; culling statistical information to determine whether a company is accidentally harming itself. As most companies are always looking to expand their businesses, or at least improve their business practices, data analysis is an essential and profitable field.
I hope this helps!
Alex Christopher Johnson