Which of the following is NOT an instance of how NLP is used?

The correct answer highlights that data encryption is not an application of Natural Language Processing (NLP). NLP is a subset of artificial intelligence that focuses on the interaction between computers and human language. It involves various tasks that enable machines to understand, interpret, and respond to human language in a meaningful way.

Chatbots utilize NLP to engage in conversations with users, interpreting the user's input and generating appropriate responses. Voice assistants also rely on NLP to process spoken language, allowing users to perform tasks or retrieve information through voice commands. Text summarization is another relevant application, where NLP algorithms condense large volumes of text into shorter summaries while retaining the essential information.

In contrast, data encryption is a method used to secure information by converting it into a code to prevent unauthorized access. This process does not involve understanding or processing natural language, which is the core function of NLP technologies. Therefore, data encryption stands out as not belonging to the scope of NLP applications.