Three types of Apple adapters are the Thunderbolt to Gigabit Ethernet, USB-C to USB, and Mini DisplayPort to DVI. All three are available at Apple Stores.
The Thunderbolt to Gigabit Ethernet adaptor allows the user to connect to a modem through the Thunderbolt port. For instance, Macbook Air does not have an Ethernet port and can only connect to a modem through Wi-Fi. This adapter enables the laptop to connect via an Ethernet cable.
The USB-C to USB enables the new Macbook to use older USB devices. USB-C is a new type of connection that has not completely replaced the older USB 3.0 and USB 2.0 ports. As such, a Macbook user needs this adapter to use older flash drives, data transfer cables and other similar devices.
The Mini DisplayPort to DVI adapter allows Macbook users to connect additional monitors to their computers. Although monitors that support Mini DisplayPort and Thunderbolt connections are available, DVI is still a widely-used video connection.