Tor Browser is the most secured and privacy Web Browser. Tor (The Onion Router) is a Darknet that tunnels your connection to multiple computers multiple times until it reach to it's final destination.
Besides privacy. Tor Browser allows you to access the Dark Web. If you don't what the Dark Web is. On the Iceberg chart. There are 3 different layers of the internet.
Surface Web where you can easy find a website through Search Engines.
Deep Web is where websites are hidden from search engines such as your Bank Account, your Netflix Library, and even unlisted YouTube videos. If you click on this link. It takes you to unlisted YouTube video that you can't normally find it on YouTube search or any Search Engines.
https://www.youtube.com/watch?v=TRmd4nDSdpk
Dark Web is basically like the Deep Web but the website is encrypted and it can only be access through Tor Network. We know there are illegal websites that are hidden through Dark Web. But Dark Web is not just for criminals. Dark Web are used by journalists, whistleblowers, and everyone who wants to be anonymous. Do you know Facebook, Reddit, and DuckDuckGo has the Dark Web version of it's websites?
There is a major con and that is the speed. Because you're connected to multiple onions. The chance are you're getting slow speed. Tor Browser is not for everyday use. It's only for anonymous reasons.
Pros
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Encrypted your traffic through multiple servers running Tor Network