Proxy servers are the mode to communicate with site that is blocked. It is a special type of network that alters the packet passing through internet where the particular IP is masked and the packet is originated at the proxy system. It is a third party server that access with many blocked sites. Proxy sites will help to mask various activities online and it can help in the networking by hosting a security threat. Thus in few cases proxy server is used in case of networking configurations. When you are dealing with multiple systems, you will have access to a central server that works as the proxy for all your system. For internet access, every part of machines is connected to your other side of router.
In most of the institutions or business, certain sites are blocked from access. It can be used externally and it will get you through the anonymity purpose and the usage will externally make difficult purpose and open up to many security systems. Thus most of the cases will open up the target server and setup considerable amount of browsing session. You can make your progression through perfect proxy server. As said before, most of the blocking is done for YouTube kind of sites. For that you can consider using youtube proxy which is the best site in the browsing session. This access the banned content with freedom to take over the shared information and with other users in the content.