In computer terms, portable means that the code in question can be easily taken to a different system and made to work there. Code that is dependant upon quirks or specific resources of a certain system is usually considered not to be portable because of the difficulties in finding means of supporting these dependencies on the new system. The use of standardized definitions and interfaces, e.g., ANSI-C and POSIX, greatly aids portability because the difficult dependencies are hidden behind the standardized interfaces and the difficulties are shifted from the programmer to the system provider