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Notice that you enter in a starting website, a word to find, and the maximum number of pages to search through.
As described on the Wikipedia page, a web crawler is a program that browses the World Wide Web in a methodical fashion collecting information.
It starts at the website that you type into the spider() function and looks at all the content on that website. Google has a whole fleet of web crawlers constantly crawling the web, and crawling is a big part of discovering new content (or keeping up to date with websites that are constantly changing or adding new stuff).

However you probably noticed that this search took awhile to complete, maybe a few seconds. Each time it visits a web page it collects two sets of data: All the text on the page, and all the links on the page. If the word isn't found in the text on the page, the robot takes the next link in its collection and repeats the process, again collecting the text and the set of links on the next page. Again and again, repeating the process, until the robot has either found the word or has runs into the limit that you typed into the spider() function.
Indexing means that you parse (go through and analyze) the web page content and create a big collection (think database or table) of easily accessible and quickly retrievable information.

So when you visit Google and type in "kitty cat", your search word is going straight* to the collection of data that has already been crawled, parsed, and analyzed.
In fact, your search results are already sitting there waiting for that one magic phrase of "kitty cat" to unleash them.

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