Are SSL certificates needed to get the trust of a visitor, even if no data is sent?

1. Are SSL certificates necessary?
2. What happens if there is no SSL certificate?
3. Is HTTPS possible without certificate?

Are SSL certificates necessary?

Why you need an SSL certificate. Websites need SSL certificates to keep user data secure, verify ownership of the website, prevent attackers from creating a fake version of the site, and convey trust to users.

What happens if there is no SSL certificate?

Without SSL, your site visitors and customers are at higher risk of being having their data stolen. Your site security is also at risk without encryption. SSL protects website from phishing scams, data breaches, and many other threats. Ultimately, It builds a secure environment for both visitors and site owners.

Is HTTPS possible without certificate?

Nope. What you're doing when using HTTPS is telling the browser to connect via a different port (443) whereas normally you connect via (80). Without a certificate, the server would refuse the connection. HTTPS is simply not possible without a certificate.