In most of the scanners (even in low price varients) the save as PDF option is available.
in that the scanned data (page) gets saved in a PDF file but not in text format but picture saved in PDF format.
in other term you cant copy particular word or sentence from the saved PDF file.
Most of the PDF writers available in the market is not 100 % good at recognizing the scanned pictured data to get converted to text but few are good at getting it converted to 98%
This PDF image to Text data converting softwares are called OCR softwares
OCR stands for Optical Character Recognition some calls it as Optical Character Reader
you can check out the bellow url to find few best softwares. Top 5 Free OCR Software Tools To Convert Images Into Text