Http commonly used in HTML pages, but other resources can also be used via http. In many cases, customers can exchange sensitive information with the server, which is secured to prevent unauthorized access. HTTPS or secure HTTP was developed by Netscape, the company gives permission, and secure transactions.
http is hyper text transfer protocol. it is used used to transfer information web pages on over internet. though it is not secure connection. and not idle for e commerce . and for online transations. for that purpose we use HTTPS which is secure .it is a secure channel on insecure network . it provide the encrypted and secure communication on network to send the sensitive information.
In my opinion, it doesn't matter if your url has https or in default http. Both url are search engine friendly. The only difference between https and http is the security. https is more secure than http cause https cause it is encrypted by SSL Certificate.