?What features do we test in Interface testing and how it is important

1. Parameter interfaces These are interfaces where  data or sometimes function references are passed from one component to another.

2. Shared memory interfaces These are interfaces where a block of memory is shared between components. Data is placed in the memory by one subsystem and retrieved from there by other sub-systems.

3. Procedural interfaces These are interfaces where  one component encapsulates a set of procedures that can be called by other components. Objects and reusable components have this form of interface.

4. Message passing interfaces These are interfaces where  one component requests a service from another component by passing a message to it. A return message includes the results of executing the service. Some object-oriented systems have this form of interface, as do client–server systems.