Final answer:
The collection of text documents to be analyzed is called a corpus, which is used in linguistics and natural language processing to analyze language patterns and build language models.
Step-by-step explanation:
A collection of text documents to be analyzed is most appropriately called a corpus. This term is used specifically in computational linguistics and natural language processing to refer to a large and structured set of texts that are used for linguistic analysis and for the development of language models.
Data from a corpus may include written texts, transcriptions of spoken language, or web pages, and these can be analyzed to understand language usage patterns, train machine learning models, and support research into how language is used in various contexts.