Encryption is the scrambling of messages from the sender on their journey to the recipient, largely to discourage the interception and reading of those messages by other parties.
This concept dates back thousands of years to coded written message sending, but now, modern forms of communication can be encrypted automatically with complex coding.
Thanks to the smartphone revolution, we now send and receive an awful lot more data between devices. All this data, be it voice calls, text messages or mobile data, is managed by whichever service provider whose service you are using. Whether or not this data is encrypted varies depending on the policy of the company providing the service.
For example, voice calls and text messages are handled by your mobile operator. This operator also provides your 3G or 4G connection to the Internet on your smartphone, but they don’t encrypt all the services you use.