HTTPS (Hypertext Transfer Protocol Secure) is an internet communication protocol that protects the integrity and confidentiality of data exchanged between a website and its users. Websites secured with HTTPS encrypt data transmitted between the user's browser and the web server, providing a secure browsing experience. Google has announced HTTPS as a ranking signal, meaning that websites using HTTPS may receive a slight boost in search engine rankings compared to non-HTTPS websites. However, websites that switch from HTTP to HTTPS may encounter indexing issues if not implemented correctly. To address HTTPS issues, webmasters should ensure that their website's SSL/TLS certificate is properly configured and valid, implement 301 redirects from HTTP to HTTPS versions of URLs, update internal links and sitemaps to HTTPS, and use the Change of Address tool in Google Search Console to notify Google of the website migration. They can also monitor the website for mixed content warnings or security issues using tools like Google's Security Issues report.