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Asynchronous Transmission

• Data is transmitted character-by-character
• Data is not saved before transmitting
• There may be gaps between characters being transmitted
• It uses start and stop bits to control the transmission of information.

Synchronous Transmission

• Data is transmitted block-by-block or word-by-word
• Data is saved before transmitting
• There are no gaps between characters being transmitted
• No start and stop bits are used. It uses clock signals to control the transmission of information.