BI analyst is who uses his technical skills and management skills to improve the business of the company. BI analysts are who is capable to forecast the problem and make strategic decisions. He has to be the intermediate between the data analytics team and clients. Take the requirements from clients to the analytics team. They have to get them solved by the data analytics team. After that, they have to make reports and present them to clients.
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For a more detailed explanation, you can watch this video on how to become a BI analyst: