What is the bead like structure in USB cables and what's the use ???

@SENSME How does the junk enter in Initially ??

@Robynthebeautiful Electrical interference from outside or internal ??

@SanaRP98 I think can be both. Other electrical appliances can be affected by your laptop or computer as well as the other way

@somkingbacon No it has some components, I need a layman explanation , but surely to for style