Every connection is secured, and any random third parties can’t access all the data transferred through it. The visitors feel the website is more secured and more comfortable to use the website. 
You don’t want your audience to come across the following message:
“This website is not secure.”

If they see this message, they will avoid your website in the future. Having an SSL Certificate can keep you safe from this embarrassment. The HTTPS shows your website has installed an SSL certificate. It helps you prevent security breaches and get secondary authentication in the shape of PKI. It helps to send information only to the receptive server. This way, the data won’t be accessible from other devices even if they share the same service.