EAN-13 is used worldwide for marking retail goods. The symbol is numeric-only and encodes 13 digits. The first two or three digits are a country code which identify the country in which the manufacturer is registered (not necessarily where the product is actually made). The country code is followed by 9 or 10 data digits (depending on the length of the country code) and a single checksum digit that is automatically added. If there are 13 digits, the last digit will be replaced with the correct checksum. There is a special form of EAN-13, called EAN-99 which just starts with "99".
As of January 1, 2005, all retail scanning systems in the United States must be able to accept the EAN-13 symbol as well as the standard UPC-A symbol. The United States has begun the process of moving to the EAN-13 symbol, which will be known as the UPC-13 symbol in the USA.
An example: