SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral. SSL is an industry standard and is used by millions of websites in the protection of their online transactions with their customers.
Shopify includes an SSL certificate that uses industry standard 256-bit encryption technology. This is the same level of encryption used by large banks to keep your information secure.