Electrostatic charger is a device used to charge objects using electrostatic induction. It works by creating a positive or negative charge on the object being charged by transferring electrons to or from the object. This type of charging is different from traditional charging methods that involve an electrical current passing through a conductor.

Electrostatic chargers have a variety of uses in different fields, including printing, copy machines, and air purification systems. In the printing industry, electrostatic charges are used to transfer toner to paper, while in copy machines, they are used to transfer images from one surface to another. In air purification systems, electrostatic charges are used to attract and trap harmful particles, making the air cleaner.

Overall, electrostatic chargers are a highly useful and important technology that help make many different products and processes possible. They have numerous practical applications and are an essential part of many modern technologies.