Websites using HTTPS can increase privacy, as the connection between the browser and the website’s server is encrypted. This means that the browser and the web server are the only points that see your browsing activity and the data you enter. Today, anyone who owns a URL can obtain a TLS/SSL certificate, needed to encrypt the web traffic, and create a HTTPS website. This, of course, includes cybercriminals. Because of this, back in 2014, Avast introduced a way to scan HTTPS URLs for malicious activity in order to protect our users from being infected via malware transmitted over HTTPS sites.
Read more here:: Avast