What is VPN? Do you know the anser. No, Then don’t worry here is your answer about VPN. VPN(Virtual Private Network) is a network that uses a public telecommunication infrastructure (internet ) to provide remote offices or individual users with secure access to their organisation’s network. at some of the places like offices, schools, colleges and in any organisation some sites are restricted by the network administrator on the LAN network.but by using VPN services you can access any of your favourate website at your network even when the site is restricted on the network. because your IP address is hidden while accessing internet via VPN and you are fully protected from online hackers which accessing with your passwords, credit card numbers and bank transfers.
One more main question which arises here is that How VPN works? You can see below in the image the working of the VPN while using the VPN services there is secure tunnel is obtained between the servers of VPN and your computer which gives you the secure browsing on the internet. Most of the VPN services are paid but here I will show you the list of 20 Free VPN services which can be used to access restricted sites anytime, anywhere.
Adobe 
Chatting is a routine work of life like facebook, Gmail, Yahoo etc is an instant messengers where we chat everyday with our friends online. Many times we need to know what we have chat with our friend in the past. We just talking about Facebook Chat History. Instant messengers like gtalk, yahoo, gmail etc provides the option of saving the chat history. Facebook lacks this feature. We all don’t know why facebook doesn’t allows to save chat history. There is an alternate methods to permanently save our Facebook chat history with the use of some extensions and addons from Chrome and firefox and a with facebook app you can save the chat history. Using A Firefox Add-On Or Google Chrome Extension Before we head off, let’s dispel a common misconception that has already earned these extensions some bad ratings. This technique does not allow you to delve into long lost conversations, prior to the usage of these extensions. Why not? Simple because Facebook does not keep those around. So unless you can find yourself a time machine, there’s no way to recover those. From the moment you’re set up however, these extensions will remember every single word said. And those can be retrieved later on.