Which type of search engine uses keywords entered by the user to find websites?

The correct choice identifies keyword search engines as those that utilize the specific words input by the user to locate relevant websites. These engines are designed to crawl the web, indexing content based on keywords to help users find web pages that match their search queries. When a user types in a keyword or a phrase, the search engine's algorithms analyze its index and return results that are most pertinent to the entered keywords, often ranking them based on relevance, popularity, and other factors.

In contrast, directory searches operate based on a structured hierarchy of categories, requiring users to navigate through organized lists rather than directly searching with keywords. Image search engines focus specifically on retrieving visual content, such as photos or illustrations, rather than text-based websites. Text-based search engines, while they encompass keyword searches, typically refer to broader types of search engines which may include more specific functionalities beyond just keyword input. Therefore, the distinction lies in the primary function of identifying and retrieving websites based on user-entered keywords, which is the hallmark of keyword search engines.