A privacy policy can give you a better understanding of how your private information will be handled by a given website. It can also help you make an informed decision about whether yes or not to use that website.
However, it’s important to keep in mind that privacy policies can differ extensively from your site to another. So, even if a website has a privacy policy in simple to read place, it’s always a good idea to take some time to read through it before providing any personal information.