If every time I were paid a penny for answering this question, I would have been a millionaire. OCR (Optical Character Recognition) simply converts your text from an image into text. OCR is a great technology, but OCR does NOT tell you specifics within the converted text, e.g. OCR will not tell you where the tax line item lies or where the PO number from your invoice. This is where advanced technology like Machine Learning that learns data patterns, interprets the data elements, and answers the above questions without telling the system the exact location of those fields. To sum it, we use OCR (if invoices are in image form), but our magic starts only after that.
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