What is the primary function of a program that uses keywords to find information on the Internet?

The primary function of a program that uses keywords to find information on the Internet is to return a list of relevant documents. When users enter keywords into a search engine, the program processes these keywords and performs an extensive search across indexed websites and documents. The goal is to identify and rank the most pertinent resources based on the keywords provided. This is fundamental to how search engines operate, as they aim to deliver the most meaningful results to users' inquiries, facilitating access to the vast amount of information available online.

In contrast, creating websites from scratch involves design and coding rather than searching for existing content. Storing files on a server pertains to data management and hosting, which does not directly relate to searching for information. Managing online databases involves organizing and retrieving structured data, which is distinct from keyword-driven document retrieval. Thus, the focus of keyword-based search programs is unequivocally on returning relevant documents to users.