Geographic location of your or your company Internet Services Provider (ISP);
Your domain registration details including name and address of the owner;
The name and address of the computer through which you send and retrieve your mail.

This information is sufficient to find out your address, phone number and other personal details.

A few years back, it was very simple to be online, without anyone knowing about your identity. Now, it has all changed, with companies getting all your personal information from a variety of sources, forcing you to try and stay anonymous on the internet.

Surfing the web anonymously will help keep your personal information secret, saving you from people who track down your online habits and other information using cookies, etc. The end result will be loads of spam mails that you are bombarded with, as your private information is sold off to advertisers.

With private browsing, you will be able to hide your information, so that the companies trying to track you can't get your exact IP address, rather than that of the proxy server. All of this will keep you private and secured.

A lot proxy sites are there, which allow you to gain access to the internet without letting anyone know about you. This option is also there in a couple of web browsers; however, it is not that effective.

You can adopt a number of other ways, to do the same, like deleting your web history, along with any cookies from the sites that you visited and other cache files. This will remove all possible traces that you have left behind while browsing the web.

You can be kept safe from being attacked and tracked. Tracking is done, when your information is taken out by the companies, through your IP address, etc.

While attacking is when the hackers get access to your information or your computer for that matter. There are many restrictions now being imposed, which require people to use anonymous browsing.

So, whether you are forced to use private browsing, or it is your personal choice for safety, it is a very good thing, since you will be surely kept private and hence, safe.