Many would not understand except the IT technical. For a lay person he wouldn`t be able to sense about this though he may be using this app for years together. In the first place let`s try to understand this. In a very simple way we can say that all the WhatsApp messages will now be accessible only to the sender and recipient.
Third parties can`t read or listen to any WhatsApp chats and calls and also adds an option for users to verify if a message came from someone they know - and not from a hacker posing as a friend.
All types of WhatsApp messages (including chats, group chats, images, videos, voice messages and files) and WhatsApp calls are now protected by end-to-end encryption.
Encryption is one of the most important tools governments, companies, and individuals have to promote safety and security in the new digital age. Recently there has been a lot of discussion about encrypted services and the work of law enforcement. While we recognize the important work of law enforcement in keeping people safe, efforts to weaken encryption risk exposing people information to abuse from cybercriminals, hackers, and rogue states.
While WhatsApp is among the few communication platforms to build full end-to-end encryption that is on by default for everything you do, WhatsApp expect that it will ultimately represent the future of personal communication.