How to extract text from an image or PDF

Extraction of text from an image or PDF file is made possible by Optical Character Recognition technology. Suppose you have a PDF book or some scanned images of text documents and you want to get the text from those images in notepad or any other text editor, then what will you do? We all know that we can't copy text directly from any image. So, here we'll use the OCR technology. I'm going to