Hyper Text Transfer Protocol Secure (HTTPS) is the secure version of HTTP, the protocol over which data is sent between your browser and the website that you are connected to. The 'S' at the end of HTTPS stands for 'Secure'. It means all communications between your browser and the website are encrypted.
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Implementing the secure switch incorrectly can hurt your site and possibly your SEO and cause a sustained loss in traffic. Redirect to HTTPS pages by server-side 301 HTTP redirects.