Suppose you have a PDF document that was made using a scanner, or otherwise consists of image data but doesn't have text data. Such a PDF can't be searched by PDF readers or desktop search applications.
Read more »Howto Make scanned PDFs searchable (OCR) using pdfocr
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Tesseract: an Open-Source Optical Character Recognition Engine
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I play with open-source OCR (Optical Character Recognition) packages periodically. My last foray was a few years ago when I bought a tablet PC and wanted to scan in some of my course books so I could carry just one thing to school. I tried every package I could find, and none of them worked well enough even to consider using.
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