A short code is a memorable 5-digit SMS number on the South African networks such as "45776" to which SMS'es can be sent. Short codes are primarily used by businesses and brands for lead generation and database building. A secondary use is it offers users the option to text message your business 24/7 via SMS.
Example: SMS the word "CRAWFIN" to “45776” to enter our school competition. 45776 is the short code, and CRAWFIN is the keyword.