What is a search engine?
A search engine is a program that you can type a word into a box and it will search the entire world of the internet everywhere it can and give you the information related to the topic. There are three ways you can use a search engine: crawling, indexing, and searching. When you crawl, you look for new content that wasn't there during the last crawl, including updates to files and web pages. Then, the programs index the information, pulling out specific keywords to categorize it. On the Internet, indexing relies a lot on keywords in web pages that has information about the page.