Custom data refers to the additional information that sellers intend to store associated with products or selling locations for detailed description, categorization, and structured organization. Custom data is a versatile feature that can be generated for various entities within a website/platform. This means that you can create custom data for products, selling locations, blog posts, or any other entity present on the website/platform. This is typically done by creating a field associated with the entity, often called a custom field, where you can enter key-value pairs to store additional information.
Custom objects refer to entities that are not currently present on the platform. Sellers can create these custom data structures, allowing them to define the essential custom fields according to their preferences. These custom objects are introduced to address unique data requirements that fall outside the platform's standard features.