In the first chapter, we introduced the running example, building a search engine. A search engine is a program that, given a query from the user, returns results ordered by relevance with respect to the query. In this chapter, we will perform the first steps--obtaining and processing data.
Suppose we are working on a web portal where users generate a lot of content, but they have trouble finding what other people have created. To overcome this problem, we propose to build a search engine, and product management has identified the typical queries that the users will put in.
For example, "Chinese food", "homemade pizza", and "how to learn programming" are typical queries from this list.
Now we need to collect the data. Luckily for us, there are already search engines on the Internet that can take in a query and return a list of URLs they consider relevant...
