Simply put, BA is similar to the position of PM (product manager), and BA is the abbreviation of English word (BusinessAnalys), that is, business demand analyst.

In IT companies, the role of BA is PM (Product Manager), but this PM has to undertake very specific business or field.

For example, banks also have their own IT departments, and the product managers of IT departments of banks may have to connect with specialized business groups, such as online banking business, credit card business, wealth management products business, fund agency business, etc., so the product managers who undertake a specific business need are called BA.