OCR, OBCR, OMR, and MICR are four technologies used to convert text and markings into machine-readable data. OCR converts printed or handwritten text into editable text using optical scanners. OBCR reads barcodes and converts the data within them into text. OMR recognizes pre-specified options marked on exam sheets to evaluate tests. MICR uses magnetic ink to print codes on checks that can be read even if overwritten. All four technologies aim to convert human-readable data into digital formats.