Standard websites use http:// at the start of URLs (web page addresses), whilst e-commerce and other websites which need to be seen to be secure use: https://
In order to be able to use https:// you will need to purchase an SSL Certificate. This service includes data encryption which means that credit card information and other personal data is more secure.
It is said that Google favours https:// websites. In addition, https:// websites are more secure from the unwelcome attention of hackers.
Your hosting service provider probably offers https:// and you will find that prices vary, depending on the amount of warranty that is offered.
A signed SSL Certificate means that there will be a secure connection between your website and your website visitors. It also verifies your identity. This means that website visitors will be reassured that their personal data is safe. A ‘padlock’ symbol or a green ‘https’ should appear within the browser (to the left of the website address).
I learnt about this subject when we wished to accept credit cards (as well as PayPal) within www.marketingcompass.co.uk …if you visit the membership page there you will see that the payment pages have the https:// within their respective URLs.