What are the disadvantages of parallel port and serial port?

A serial port is a totally different electrical device thus, as far as I know, can not be converted to a parallel port due to differences in protocols and baud rates/data rates on the port. You can...

A serial port is a 9 pin, RS-232 connection usually used for Terminal connections and older modems as well as some mice and older keyboards for example. It has lost much of it's popularity and is...

Parallel port At a time one or more data can be transfered though parallel ports

the speed of serial ports are slow. but we can send data on long distances as serial cable have low cost.