Which of the following is an example of unstructured data?

Unstructured data refers to information that does not have a predefined data model or is not organized in a predefined manner. This type of data is typically more difficult to analyze because it does not align with the traditional structures of rows and columns found in databases.

Images and text files are prime examples of unstructured data; they do not conform to a specific format that allows for easy analysis, storage, or retrieval. The content in images is visual, while text files can contain free-form text without a fixed structure. This contrasts with structured data like database tables, where data is organized in a clearly defined way, allowing for straightforward querying and data management.

Understanding the nature of unstructured data is crucial in fields such as data engineering and analytics, as it often requires specialized processing techniques such as natural language processing for text or image recognition technologies for analyzing visual content.