Explanation:
Semi-structured data is information that has some structure, but which allows for some variation between entity instances. For example, while most customers may have an email address, some might have multiple email addresses, and some might have none at all.
One common format for semi-structured data is JavaScript Object Notation (JSON). The example below shows a pair of JSON documents that represent customer information. Each customer document includes address and contact information, but the specific fields vary between customers.
https://learn.microsoft.com/en-us/training/modules/explore-core-data-concepts/2-data-formats