Which of the following defines 'natural languages'?

The definition of 'natural languages' refers to languages that are spoken or written by humans for daily communication. These include languages such as English, Spanish, Mandarin, and countless others that evolve and are used in everyday interactions. Natural languages are characterized by their richness and flexibility, allowing for the expression of complex ideas, emotions, and nuances.

In contrast, programming languages, formal languages for logical reasoning, and machine languages serve specific purposes that differ fundamentally from natural languages. Programming languages are structured systems created for writing software, while formal languages are used in mathematical and logical contexts for precise reasoning. Machine languages consist of binary code that computers process, which lacks the inherent flexibility and expressiveness of natural languages. Thus, the characterization of natural languages as those commonly spoken and written in daily life is accurate and reflects their role in human communication.