Confluence can search content including pages, blog posts, emails, Microsoft Word documents and Excel spreadsheets, PDF documents, and more.
As well as using the search box at the top right of every Confluence page for ad hoc searches, you can use the 'Search' macro to embed particular search results in a particular page.
E.g. you could use the following code to find content that contains the word 'documentation':
{search:tutorial}
... giving this:
Found 10 search result(s).
ANSYS Fluent 18 tutorial guide.pdf
(IMTsoftware
> ANSYS)
PDF Document - 35,30 MB - 04.07.2019 - Download - Attachments
PDF Document - 35,30 MB - 04.07.2019 - Download - Attachments
malab_tutorial.1393405255.pdf
(IMTsoftware
> MATLAB)
PDF Document - 820 kB - 20.06.2019 - Download - Attachments
PDF Document - 820 kB - 20.06.2019 - Download - Attachments