Liquid is a templating engine written by Shopify. We've extended and customized Liquid in Rock to form our own templating engine called Lava (get it... liquid rock...). You've already been briefly exposed to the power of Lava in the introduction of this manual. Lava is used in several places in Rock, so it's worth your time to learn it well. Below are just a few of the places it's used: HTML Editor: Used for dynamically mixing in personal merge fields with your content.Menus: Navigation menus and page lists use Lava to assemble the HTML that is used to display them on the page.Email Content: Emails and SMS communications use Lava to personalize their content. Learning Lava will make you feel like a superhero. Definitely take the time to master it. We've provided some great resources for you to learn Lava on our website.