What does the `{{ ... }}` syntax signify in Liquid?

The {{ ... }} syntax in Liquid is used to denote an output statement. This syntax instructs the Liquid template engine to access and display the value of a variable or an expression within the delimiters. For example, if you have a variable called product.title, using {{ product.title }} will render the title of the product on the page.

This output is important for generating dynamic content based on the data provided to the Liquid template, allowing developers to create more personalized and interactive shopping experiences on Shopify. It's fundamental for pulling information from the store's backend and displaying it on the frontend, making it essential for theme development.