What are the guided and unguided transmission media and what are the differences?

 They are forms of of carrying data from communication devices. The difference is the medium where the signal travels.

Explanation:

Hi, the difference between guided and unguided media is that in the guided media, the signal travels through a physical medium whereas, in unguided media, the signal travels through the air.  

Guided and unguided media are types of transmission media.

The transmission media carries electromagnetic signals, that transmit data between communicating devices like computers.

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the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses