You came to one unknown website, how can you check whether it is safe or unsafe to browse? There may be monsters outside!
Lot of website contains Virus, Malware containing downloads or phishing software installed (Readers are advised to visit respected Microsoft Most Valuable Professional Corrine’s Security Garden to learn about security in general).
If you enter a website address, the result is given instantaneously, if it has been evaluated by Norton. For example, I am showing you, example of Corrine’s blog site:
There are community reviews too. Anyone can opine about any website; this example of Microsoft’s official website:
Relatively, new websites are not evaluated by Norton. Also, sometime despite Norton’s declaration of a website as safe, user reviews shows it is not that safe: community review is thus helpful:
It is a potentially dangerous site as declared by safeweb:
You can download Norton SafeWeb Lite for free too for checking without need to visit Norton’s safeweb website.