http connection: http or hyper text transfer protocol can provide insecure and unencrypted connection between user and server. Any third party user(hacker) can easily access your web data and able to destroy your web server. http connection is look like http://www.example.com
https connection: https is secure http connection which can established secure and encrypted connection between user and web server. Any third party user(hacker) can't able to access your web-server and your data keep safe. For https connection you need to buy ssl certificate. You can buy ssl certificate from here. https connection is look like https://www.example.com
