A barcode is a Select one: a. coded instruction needed to control computer hardware. b. confidential computer code required by HIPAA. c. series of bars and spaces representing numbers or letters. d. unique number given to each test request for ID purposes.

A bar code is a  series of bars and spaces representing numbers or letters.

A method that is used for the purpose of representing a data in the form of a picture or image that can be easily understood by the machine. It consists of many lines that has different widths and spaces. They either represent the letter or a number. These are mainly used for the representation of data in the machine understandable format.

For example an UPC-A bar codes has 12 numbers. The numbering system is represented by the first digit. The manufacturer will be represented by the next five digits in it. The product will be represented by the five digits following it. Check digit is represented in the last digit.