OMR (Optical Mark Recognition) and OCR (Optical Character Recognition) are two methods of getting information from paper into a digital format. Although both seem to work in similar ways, there is a major difference between OMR and OCR. The responsibility of OMR is only to tell whether a mark is present or not in a predetermined area. 

Read more: Difference Between OMR and OCR | Difference Between | OMR vs OCR
OCR---------> OCR is Optical Character Recognition. A printed matter is scanned with a high resolution scanner as an image. On the software side the software recognises Letter 'A' as A and stores the information. Likewise this regognition is done on the whole image, converting it into a document in the editable format. Particularly useful for reprinting an old book with editings where no softcopy is available, and for many other purposes depending on the need........... OMR--------> OMR is Optical Marks Recognition. Marks or markings is given in a particular form by the user by pen or pencil. On the hardware side there is a highspeed Mark Recognition Scanner with software support. Different values are given for different markings. The scanner quickly scans the form and convert the markings into data, which inturn can be used for various purposes. ie; instead of writing a form in a bad handwritting, the person entering the data struggling with that, and entering wrong data, the OMR method is more reliable for the user, what you marked is what you get.
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