Liquid is an open-source template language created by Shopify and written in Ruby.
Liquid is primarily used in channels to create field-mapping rules, but can also be used to formulate Product Rules in the PIM. Liquid is used to build the contents of a Channel field from multiple product Attributes. You can also build complex conditional rules to populate Channel fields using Liquid.
Want to learn more? Read our guide to Using Liquid in Comestri