Electromagnetic waves and charge are closely related.
Most objects have close to zero net electric charge since they are made of neutral atoms.
The atoms themselves are neutral but made from equal numbers of positive and negative charges. However, if you rub two objects together one of them will acquire electric charge from the other. A rubber comb rubbed through hair becomes negatively charged leaving your hair positively charged. Positive electric charges attract negative charges. This attraction occurs through the air which separates the charges, and even occurs if there is a vacuum between the charges.