Google released a compilation of in-depth research on vulnerabilities in Apple's operating system Thursday night.

The research is interesting and comprehensive, but the impact of the flaws on most iPhone users may not be huge. Also, Google is using the compiled research to publicly needle Apple, following Apple's campaign to differentiate its products on privacy and security.

Here are some top takeaways from the report.

This is not one "bug," but a series of related flaws or problems compiled together in one place by Google's Project Zero. The release involved several in-depth studies Google's Project Zero researchers have conducted over the years. In many cases, the bugs discovered were reported to Apple and fixed with subsequent iOS releases.

Most of the vulnerabilities have already been reported. In one case, a partner researcher from 360 Security, a mobile security application company, earned $200,000 in a November 2018 public hacking competition competition for discovering the previously unknown flaw.

Project Zero is Google's test ground for finding so-called "zero-day exploits" in operating systems, software and hardware. "Zero day" is a reference to the number of days the public has had to use a known patch to a previously unknown vulnerability, so when a vulnerability is newly discovered, it is considered "day zero" of being able to fix it.

The flaws typically start, according to the research, with a targeted "watering hole" attack. In this type of attack, a hacker compromises a single website that is expected to be popular to a specific group of people that the hacker is targeting. Simply visiting the site infects the user's device with malicious code that can be used for a variety of purposes. In this case, it was used to monitor what a user does on their iPhone.