The incompatibilities in speed between the various devices and the CPU make I/O synchronization difficult, especially if there are multiple devices attempting to do I/O at the same time. To handle these problems data is usually stored

In a buffer

Explanation:

We can define a buffer as a temporary holding area for data between the various devices and the CPU make I/O synchronization especially if there are multiple devices attempting to do I/O at the same time.

Items stored at the buffer helps to reduce the The incompatibilities in speed between the various devices and the CPU.

maybe when you are listing people names in a job.

i am not 100% sure