Avast, an antivirus company, has been selling web browsing data of its users to various companies through its subsidiary Jumpshot. The data includes information on users' searches, clicks, and movements across websites, and can be used to track user behavior. Avast claims to have more than 435 million active users per month, and Jumpshot says it has data from 100 million devices. The company has announced it will stop the Jumpshot data collection and wind down Jumpshot's operations after the investigation was made public.