Secure Sockets Layer it help a website to make more secure if any website have no ssl that means this website note secure for user data , Any time data can be hacked a hacker can easyly grab data which website easyly . A visitor can not trust this website . SSl can be help for google rank a website .

ssl helped for websit to SEO.

http is not secured But https are secured for user

HTTP — Hypertext Transfer Protocol. HTTP

HTTPS — Hyper Text Transfer Protocol Secures