Custom software development is the designing of software applications for a specific user or group of users within an organization. Such software is designed to address their needs precisely as opposed to the more traditional and widespread off-the-shelf software.
custom software is developed for a single customer it can accommodate that customer's particular preferences and expectations. Custom software may be developed in an iterative processes, allowing all nuances and possible hidden risks to be taken into account, including issues which were not mentioned in the original requirement specifications.