SSL (Secure Sockets Layer) is a standard technology behind establishing an encrypted connection between a web server (host) and a web browser (client).
SSL is the backbone of our secure Internet and it protects your sensitive information as it travels across the world’s computer networks.
The primary reason why SSL is used is to keep sensitive information sent across the Internet encrypted so that only the intended recipient can understand it
Web browsers give visual cues, such as a lock icon or a green bar, to make sure visitors know when their connection is secured. This means that they will trust your website more when they see these cues and will be more likely to buy from you.
In order to accept credit card information on your website, you must pass certain audits that show that you are complying with the Payment Card Industry (PCI) standards. One of the requirements is properly using an SSL Certificate.
Google has announced that going HTTPS — adding a SSL 2048-bit key certificate on your site gives websites a ranking benefit, counting as a “very lightweight signal” within the overall ranking algorithm.
So improving the website security practices will directly improve user’s experience.