The correct answer is Structured data and unstructured data. This pair specifically contrasts data kept in predefined fields with data that does not follow a fixed schema.

Structured data is organized according to a defined schema such as tables with rows and columns, which makes it straightforward to query with standard languages and tools. Typical examples include relational databases, spreadsheets, and CSV files that enforce column definitions.

Unstructured data lacks a fixed schema and consists of free form content such as documents, email, images, audio, and video. It requires indexing, extraction, or specialized processing to locate or derive meaningful fields and attributes.

Personal data and non-personal data classifies information by whether it identifies an individual and is about privacy rather than about whether the data follows a schema. That distinction does not tell you if the data is stored in predefined fields.

Encrypted data and plaintext data describe the protection or encoding of data and relate to confidentiality. Encryption does not imply a particular structure, so this pair does not answer the schema question.

Data at rest and data in transit describe the location or movement state of data rather than its internal format. These terms indicate where data resides or how it is being transferred and not whether it uses predefined fields.

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