Using a keyword, a search engine returns a list of related sites known as:

When you use a keyword in a search engine, it returns a list of related sites known as search engine results pages (SERPs). Here's how it works:

1. Open your preferred search engine: This could be Google, Bing, Yahoo, or any other search engine.

2. Enter your keyword or search term: In the search bar, type the word or phrase you're interested in. This could be anything from a simple word to a complex question.

3. Press Enter or click the Search button: This will initiate the search.

4. View the SERPs: The search engine will now display a list of web pages that are relevant to your keyword or search term. These results are what's known as the search engine results pages (SERPs).

5. Browse the results: You can now click on any of the results to visit the corresponding web page. The results are usually ranked based on relevance and quality, with the most relevant and high-quality pages appearing at the top.

6. Refine your search: If you didn't find what you were looking for, you can try refining your search by adding more specific terms or using advanced search features.

Remember, the goal of a search engine is to provide the most relevant and high-quality results for your search term, so it's important to be as specific as possible with your keywords.