A charger is a power supply device used to charge electronic devices, which can convert electrical energy into voltage and current suitable for device use. According to different usage objects and working principles, chargers can be divided into the following categories:

　　1. Mobile phone charger: A mobile phone charger is one of the common types of chargers used to power and charge handheld devices such as mobile phones, smartphones, and tablets. Mobile phone chargers generally use USB interfaces to output lower voltage and current to meet the charging needs of mobile devices.

　　2. Laptop charger: Laptop chargers are used to power and charge portable electronic devices such as laptops and tablets. It generally uses standard AC power plugs to output higher voltage and current to meet the charging requirements of laptops.

　　3. Car charger: A car charger is a charging device that can be used in a car to charge mobile devices such as phones, tablets, etc. Car chargers are generally powered by car cigarette lighter sockets and output voltage and current suitable for charging onboard devices.

　　4. Power bank/portable power bank: Power bank (also known as portable power bank) is a portable charger that has a rechargeable battery built-in and uses interfaces such as USB to output voltage and current to power and charge various mobile devices. It is typically used outdoors, during travel, or in emergency situations to provide a portable power supply.

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