There are two code types used for barcodes: Continious type and Discrete type.
Common continuous type barcodes include EAN, Interleaved 2 of 5, CODE-93, CODE-128. Its character density is high, but is very difficult to print.
Common discrete type barcodes include, NW-7 (CODABAR), CODE-39, etc. Its character density is comparatively lower than other “higher-quality” barcode symbologies and is easy to print.
(See continuous, and discrete)CreativeMinds WordPress Plugin Super Tooltip Glossary