Repeaters is only hardware device.
Repeaters re-generate the original bit pattern.
|Figure: Repeaters in Computer Network|
The purpose of repeater is to extend the LAN segment beyond its physical limits.
Repeaters are used to connect two physically close building together.
Repeaters operate at the "Physical layer" of OSI model.
Repeaters can join two different physical physical media but they must use the same access method.
Repeaters handle only the electrical and physical characteristics of the signal.
Repeaters works only the same type of physical layer as Ethernet-to-Ethernet.