The major difference can be understood by their name also which is in https it goes as Hyper Text Transfer Protocol Secure. Https is highly secure and less prone to hacking. Https uses data encryption to provide more security and privacy than http. However you can switch between them but it must be done when your website is not too busy. Https is slower than http. In today’s day to day work https is widely used all over the globe . The main reason behind it is the data security it provides which dominates its disadvantage which is of being a slower connection than http.