Why is it important to understand alternating current when learning about networks?

The DC signal changes over time, so standards groups cannot easily use it to describe how data can be encoded for electricity. The AC signal changes over time, which gives standards groups more options for how to encode data using electricity. The DC signal does not accurately reflect how data is transmitted, so AC is the preferable method for developing encoding s$$hemes$.$

The AG signal does not change over time, which gives standards groups more options for how to encode data using electricity.