An adapter is an interface device used to enable two different devices or systems to work together.

　　From a hardware perspective, power adapters are the most common type in the electronics field. Its main function is to convert external power sources (such as mains power) into a power form that the device can use. For example, converting AC power to DC power and adjusting it to appropriate voltage and current values to meet the power supply needs of electronic devices such as laptops and mobile phones. Power adapters typically include electronic components such as transformers, rectifiers, filters, etc., which work together to achieve power conversion.

　　In the field of computers, there are also network adapters. A network adapter, also known as a network card, is the interface between a computer and a network. It can convert the data signals inside the computer into signal formats that can be transmitted over network media such as twisted pair cables, optical fibers, etc., and also convert the signals received on the network into data formats that the computer can recognize, enabling the computer to communicate with other network devices.

　　From a software perspective, the adapter pattern is a design pattern. Its function is to convert the interface of one class into another interface that the client wants, so that classes that were originally incompatible with each other can work together. For example, when exchanging data between different database systems, it may be necessary to write an adaptation layer to match the operation interfaces of different databases.

　　In short, whether in the field of hardware or software, the core role of adapters is to solve the problem of incompatibility between different devices, systems, or interfaces, enabling them to work effectively together.

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