An iPart is an iMIS-specific web part that represents a building block of features that you can place on a content record with other building blocks to create new pages of features. Multiple iParts can be combined and displayed in a content record as you prefer.
Default iParts appear throughout iMIS. You can modify them for your needs and you can reuse iParts throughout the system. For example, an iPart displaying a roster for a Membership Group can follow the same user behavior patterns as an iPart for a roster in Events.