Precision vs. recall

- [Instructor] Before we start with Azure Search,…I would like for you to walk through…some of the search fundamentals.…Information retrieval has been one of the most…fascinating topics when it comes to computer science,…and it adheres to a typical kind of vocabulary.…One of the first things I'd like to talk about…are precision versus recall.…Whenever we talk about any search engine,…precision is a very important aspect.…Precision means the fraction of retrieved instances…that are relevant.…

And recall is the fraction of relevant instances…that are retrieved.…I know it's kind of confusing.…Let's take an example.…Let's say we have a query,…and our query says I want to look for a company…which has a name Cazton.…And this looks like a point query…that we're going to make to a search engine.…Let's assume that we have the search engine…that's talking to a data store,…and the data store has total results that are 120,025…records for company 25.…

And the relevant results are only 25.…So we're left with 120,000 irrelevant results.…