WHAT IS THE SMALL CYLINDER WORK USE IN CHARGING CABLE ? (CHARGING CABLE ME CHHOTA CYLINDER KYA KAAM KARTA HAI ?)

Hello friends, ap sabhi ne Mobiles, Laptops, Camera to use kiye hi honge our jab ye devices discharge ho jate hai to ham inhe charging par lagate hai to friends aj ka hamara topic bhi charges me use hone wale cylindrical module ke bare me hai, ap soch rahe honge ke ye kya hota hai to me apko bat du friends ke in devices ko charge karte time apki nazar charger ke shocket ke pas lage ek small cylindrical module par to gai hogi issey "Ferrite bead" kehte hai,

Ab question ye ata hai ke issey kyu lagaya jata hai kyu use karte hai ? our ye karta kya hai ? to me apko bta du friends ke ye jo "Ferrite bead" hai ye high frequency noise ko compress karta hai our ye apki devices ko Electromagnetic noise se bachata hai iss bead se noise disturbance ruk jata hai our device me koi problem nahi aati hai jaise screen blink karna etc. ye conductor ki tarah kam karta hai, isme energy only charging ke hi use hoti hai mean charging ke liye time and energy dono save hoti hai.