Thunderbolt is a high-speed interface technology developed by Intel and Apple. It allows for the transfer of data, video, and power through a single cable and supports speeds of up to 40 Gbps. Thunderbolt can be used to connect a wide range of devices, including external hard drives, displays, and cameras, and it also supports daisy-chaining, meaning that multiple devices can be connected together through a single Thunderbolt port. Thunderbolt technology is supported on many newer Mac and Windows computers, and can also be found on some newer displays and peripherals.