Proxy servers are accustomed to reach Internet by routing your request to your proxy server instead of straight with whom you’re communicating with to the server. A request is made by the proxy server for you and return the results of exactly the same back for you. It can help in instances of Internet censorship when web service or a certain web site is prohibited in where you are, be it a nation or an office.
Example: Media players etc, Web browsers, FTP clients.
There are just two bars which reveal the fitness of the proxy server in case you start to see the list. First one shows the other shows the link time as well as the speed. So just look for those which reveal state that is green and thus are a great option.
And additionally I’d recommend to prevent using proxy servers for transferring any information that is sensitive bank accounts etc. You cannot be certain what they are able to do (I mean they may be technically achievable of saving what information you pass through them which means your login credentials are shown. When you yourself have some questions, don’t hesitate to give me a yell in the comments.