module
noun [ C ]
uk/ˈmɒdjuːl/ us/ˈmɒdʒuːl/one of a set of separate parts which, when combined, form a complete whole:
The emergency generator is transported in individual modules, which are then put together on site.
IT
a part of a computer or software system or program that has a function and works together with other related parts:
The full computer program is made up of several modules.
one of the parts that a course of study is divided into, which covers a particular subject and often has its own examination:
The course will include a 3-week module on environmental management.