Introduction:
Framing is an important concept in the field of computer networking that involves breaking the data into smaller, manageable units for efficient transmission. In asynchronous means of communication, framing plays a crucial role in ensuring accurate and reliable data transfer.

Explanation:
Asynchronous communication refers to a mode of data transmission where data is sent in an unsynchronized manner. Unlike synchronous communication, there is no fixed timing or clock signal to indicate the start and stop of data transmission.

Importance of Framing:
Framing is used in asynchronous communication to establish a structure or format for data packets. It helps in identifying the boundaries of each data unit, ensuring that the receiver can correctly interpret the incoming data. The following points explain how framing is used in asynchronous means of communication:

1. Start and Stop Indication:
Framing involves adding special characters or bit patterns at the beginning and end of each data unit. These characters act as start and stop indicators, signaling the receiver about the start and end of a particular data packet. By using these indicators, the receiver can easily identify the boundaries of each unit and extract the data accurately.

2. Delimiting Data Units:
Framing helps in delimiting the data units, i.e., separating individual packets from the continuous stream of data. By breaking the data into smaller units and encapsulating them with start and stop indicators, framing ensures that the receiver can distinguish one packet from another.

3. Error Detection:
While framing primarily focuses on identifying the boundaries of data units, it can also be used for error detection. By including error-checking mechanisms such as checksums or parity bits within the framing structure, the receiver can detect and correct any transmission errors that might have occurred during data transfer.

Conclusion:
In asynchronous means of communication, framing plays a vital role in establishing a structure for data units. It enables the receiver to accurately identify the start and stop of data transmission, delimit individual packets, and potentially detect transmission errors. Therefore, option 'B' - "It tells us about the start and stop of the data to be transmitted or received" - best describes the use of framing in asynchronous communication.