When planning an information system, a company must consider how a new system will interface with older systems. These are called legacy systems.
A legacy is something that's older and sometimes leaves behind a tough act to follow or, something that a company is use to working with and is afraid of change. This system is software, application programs or other technically that is up to date but the supplier doesn't issue maintenance support for any longer. In many cases, legacy systems are a pain to a company especially when training new hirers.
