Let me explain briefly.

1, according to the original definition, data transmission rate and bandwidth are two concepts. As can be seen from the unit, the unit of the former is bps (bit/second) and the latter is Hz (hertz).

There is a clear relationship between them. For a physical channel, if the bandwidth, noise, transmission medium and so on have been determined, then its maximum transmission rate (limit rate) is also determined according to Shannon theory. Different modulation techniques (from 2FSK, QPSK, 16QAM, 64QAM to 128QAM) can be used to obtain different data transmission rates, but they are always less than the limit defined by Shannon. On the other hand, for a physical channel, if the noise, transmission medium and modulation technology are all determined, the wider the bandwidth (for example, 10MHz to 20MHz) means the higher the data transmission rate.

3. After the rise of the Internet, the concept of communication has entered the ordinary people from the professional field. In business promotion, some people began to use the word bandwidth to describe the data transmission rate. Over time, it has become a practice. Now, bandwidth has become two meanings, rigorous meaning is still the original meaning, and extended meaning is data transmission rate. For example, Internet access services have specifications such as 2M "bandwidth" and 4M "bandwidth", which are actually 2Mbps and 4Mbps, not real "bandwidth" but "data transmission rate".

Your adoption is my motivation, and there are still some things I don't understand. Please continue to ask questions!

If you have other questions, you can ask me for help. It is not easy to answer questions, understand each other and help each other!