Definition - What does Serial Communication mean?
Techopedia explains Serial Communication
There are several advantages with serial communication. As there are fewer conductors in contrast to parallel communication, the cross-talk issue is significantly less. Interconnecting cables are fewer, and there is no need for a serializer/deserializer in any case. The data transfer rate, however, may be low in comparison to parallel communication. Nevertheless, the clock skew problem that often happens between different channels of communication is not an issue with serial communication.
Compared to parallel communication, serial communication has better signal integrity. In addition, serial communication is one of the cheapest modes of communication that can be implemented, and over long-haul communication, it can provide numerous benefits.