A relay is an electric switch operated by a signal in one circuit to control another circuit.

Look up relay in Wiktionary, the free dictionary.

Relay may also refer to:

• Stage station, a place where exhausted horses being used for transport could be exchanged for fresh ones
• Cursus publicus, a courier service in the Roman Empire
• Relay league, a chain of message-forwarding stations

• BITNET Relay, a 1980s online chat system
• Mail relay, a server used for forwarding e-mail
  • Open mail relay, such a server that can be used by anyone

• Relay (satellite)
• Broadcast relay station, a transmitter which repeats or transponds the signal of another
• Microwave radio relay
• Relay channel, in information theory, a communications probability modeling system
• Telecommunications Relay Service, a telephone accessibility service for the deaf
• Repeater, an electronic device that receives and retransmits a signal

• Citroën Relay, a marketing name for the Fiat Ducato van
• Saturn Relay, a 2005-2007 minivan

• Relay (shop), a France-based chain of convenience stores
• Relay (company), a peer-to-peer political texting platform
• "Relay" (song), 1972, by The Who
• Relay bid, in contract bridge
• Relay race, completed in parts by several participants of a team
• Relay neuron, in anatomy
• Relay box, a piece of postal infrastructure.

• Retransmission (disambiguation)
• Relais

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