Difference between Input and Output Interface Unit

Computer system operates the computation on the digital signals but the user sends analog signals to the computer system. Interface Units are basically used for the conversion of the signals in the computer system so that mutual communication and understanding can be established between environment and computer system. Interface Units are of two types: 1. Input Interface Unit: Input interface unit is a type of interface unit which is used in computer system to convert analog signals into digital signals. It basically converts the user signals into signals used by the computer system. 2. Output Interface Unit: Output interface unit is also a type of interface unit which is used in computer system to convert digital signals into analog signals. It converts computational signals used by the computer system into the user signals.
Difference between Input and Output Interface Unit :

INPUT INTERFACE UNIT	OUTPUT INTERFACE UNIT
It is used for conversion of analog signals into digital signals.	It is used for conversion of digital signals into analog signals.
It takes input from input conditioning unit.	It takes input from the system after computation.
It gives output to the system for computation.	It gives output to the output conditioning unit.
In some systems, it is directly associated with sensor.	In some systems, it is directly associated with actuators.
Input here is analog signals.	Input here is digital signals.
Output here is digital signals.	Output here is analog signals.
It is a mediator between user and system so that system can understand user signals.	It is a also mediator between user and system that helps user to understand system signals.