Every visitor to a site served over plain HTTP sends their form submissions - names, phone numbers, messages, sometimes passwords - across the network in readable text. Anyone sharing that network can read them.
Browsers have responded by marking HTTP pages as "Not secure" in the address bar. For a business site, that label appears next to your name at exactly the moment a customer is deciding whether to trust you with an enquiry.
What HTTPS actually gives you
Encryption in transit, so form data cannot be read en route. Integrity, so a network operator cannot inject adverts or scripts into your pages. And authentication, so a visitor knows they reached your server and not an impostor.
Getting it done
Most hosting control panels now include free Let's Encrypt certificates - it is a checkbox, not a purchase. Once the certificate is live, redirect all HTTP traffic to HTTPS, and add the HSTS header so browsers stop trying HTTP at all.
One detail people miss: after switching, audit your pages for resources still loaded over HTTP. A single image or script on an http:// URL turns the padlock into a warning.
If you are unsure whether your site is configured correctly, we will check it for you.