Which of the following is an example of unstructured data?

An example of unstructured data is a collection of images because such data does not adhere to a predefined data model or structure, making it difficult to analyze using traditional data processing methods. Unstructured data refers to any information that does not have a clearly defined format or organization.

Images, by their very nature, contain visual information that isn't easily categorized or quantified without the use of specific analysis tools. This lack of structured data layers like rows and columns, which would typically characterize structured datasets, means that it often requires advanced techniques such as image recognition or machine learning to extract valuable insights.

In contrast, relational database entries, JSON files, and Excel worksheets represent structured or semi-structured data. Relational databases consist of tables with defined relationships and data types, while JSON files maintain a structured format that is easily readable for data interchange. Excel worksheets organize data in rows and columns, allowing for straightforward data analysis using traditional tools. These structured types provide a clear format that enables easy classification and analysis, which is not present in the collection of images.