If installed, they usually feed users with coupons, banners, surveys, pop-ups (pop-up windows), and other intrusive ads. There are many adware-type apps on the internet, however, most operate in a similar manner. Furthermore, apps of this type usually display intrusive ads and collect browsing-related data. These are categorized as potentially unwanted apps (PUAs), which most users install unintentionally.
This is a common problem and is usually caused by installed adware-type applications. In other cases, it reopens even when users force quit it, or it opens when users have just logged into the Mac.
Many users experience a problem relating to the Safari browser whereby it repeatedly reopens. What is 'Safari Keeps Opening By Itself'? How to remove 'Safari Keeps Opening By Itself' from Mac?