Schema
The defined structure of a dataset: field names, data types, and which fields are required.
A schema describes the shape of a dataset before anyone looks at the actual rows. It lists each field, its data type (string, number, date, URL, etc.), whether it's required, and what it means. A good schema lets a new user, a buyer, or an AI system understand a dataset without having to reverse-engineer it from the raw values.
Example
DatasetsBuilder.com template schemas define fields like `business_name` (string, required) and `review_count` (number, optional) before a single row is filled in.