Which function is used to include a snippet in a Liquid template?

The function that is used to include a snippet in a Liquid template is "render." When using the "render" function, it provides the ability to incorporate reusable components, such as snippets, into your Liquid templates. This method not only includes the specified snippet but also creates a new context for it, allowing for the passing of local variables when rendering the snippet. This is significant because it can enhance code modularity and maintainability by allowing developers to break down templates into smaller, more manageable pieces.

In contrast, the "include" function was previously used for this purpose; however, its usage has been generally phased out in favor of "render" due to the improvements in how local variables are handled and the overall performance benefits. The other options, "embed" and "import," do not exist as functions in Liquid for including snippets. Therefore, understanding how to effectively use "render" is crucial for a developer working in Shopify theme development.