Final answer:
Asynchronous transmission is the process where data is transmitted immediately as it arrives without synchronization between the sender and receiver, unlike synchronous transmission which relies on timed intervals.
Step-by-step explanation:
In asynchronous transmission, there is no synchronization. When the frame arrives, it is transmitted immediately without waiting for a clock signal. This is in contrast to synchronous transmission where data is sent at regular, timed intervals that are synchronized between the sender and receiver. Asynchronous transmission is commonly used in scenarios where data is sent sporadically rather than in a steady stream, such as in the transmission of keyboard data to a computer or in some forms of network communication.