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  <img class="date-icon" src="/icons/outline/date-blue.svg" alt="Calendar" />  Module 1 
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# Why Keyword Search Struggles

In its simplest form, keyword search retrieves documents by matching query terms against terms in the document. In other words, it matches the words themselves, not what they mean. It works when the query and document use the same vocabulary, but it can miss relevant results when the same intent is expressed differently.

![Keyword search only matches documents that contain the exact words "car" and "repair"](/courses/beginners/module-1/car-repair.png)

That creates a few common problems:

- **Different words, same meaning:** "car repair" misses "automobile maintenance."
- **Same word, different meaning:** "Apple stock" can retrieve fruit content instead of financial information.
- **Same words, different order:** "dog bites man" and "man bites dog" contain the same terms, but mean very different things.