In the beginning of the internet, you could say and do anything. You were free to search for any topic, view any content you could find, and share just about anything you wanted. You can now see that this extreme freedom is getting more and more compromised as governments look to control more of the information that citizens have access to and what they can share online. Even hackers use the internet to gain knowledge of your physical or virtual location for their own nefarious and harmful purposes. Sometime content available in one part of the world is restricted by your current geographical location.
Virtual Private Networks (VPN) extend your private network across a public network, giving you an opportunity to send and receive information across the public network as if it were a part of your own private network, with appropriate security and a degree of anonymous access.
Each VPN service can perform differently, and not all of them provide the same level of access or security. There are other ways to achieve some or all of these goals besides VPN, but all of them have their downsides. You should consider a VPN solution if you are interested in web anonymity, but they could result in the noticeable loss of browsing or download speed.