this post was submitted on 15 Aug 2023
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Baud rate is the maximum number of transitions per second of the state of a transmission medium. Hz is the actual number of cycles per second, so it varies degending on the data transmitted. Bitrate is the number of bits transmitted per second.
Usually bits are transmitted in groups with some redundancy to allow errors to be corrected. E.g. early Ethernet used 8b/10b encoding; 8 bits of data were transmitted as a 10 bit "symbol".
With a 1b/1b encoding baud rate would equal bit rate, but in practice that was essentially never used so the numbers woud diverge. Bitrate is more meaningful to the user.
SI and binary prefixes can be applied to baud, so kilobaud is certainly a word.