# Definitions A lot of the business objects in Ucommerce are based on definitions, which are also referred to as dynamic entities. This article will cover how to work with definitions to make your store more flexible. ## List of definition-based entities The definition-based entities in Ucommerce are: * Store * Catalog * Category * Product * Promotion * Payment method * Shipping method * Order/Cart, as they share a definition * Criterion * Discount --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://dev.ucommerce.net/readme/definitions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.