What does "I/O tasks" mean?

Question

Programming

Very often I meet in books - I / O tasks, I / O tasks. But I still don't fully understand what it means?
As I understand it, one of the I / O tasks is working with the disk. And what else are there?

Answer 1

Work with a disk, with a network, with other connected devices and data sources. In general, any operations where you read or write data.