As machine learning deals with data, one can use it anywhere. These are some of the things that come in my mind.
In a business mostly ML is use to create models to predict some results. Using data of past activities and ongoing ones, a good prediction model can be built.
Ex : How much sales will the company make in the coming month?
Statistics and visualisation is a key to make decisions about an aspect in business. ML comes into play here again and also some visualisation tools that help the cause. Ex: The percentage of stock as compared to previous years.
Every business aims at having best relationship with customers. So ML and AI algorithms are applied to track the customers move and give suggestions on products/ show relevant ads etc.
Also as many have mentioned here, network security is also handled by ML algorithms.
Hope this helps!!