If i want to conect a raspberry pi 3 with a gsm modum, Computer Engineering

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If i want to conect a raspberry pi 3 with a gsm modum

port = serial.Serial("/dev/ttyAMA0", baudrate=9600, timeout=0.5)

IF i want to conect a raspberry pi 3 with a GSM modum through a serial port , and since the GSM modum is talking at 9600 (by datashet) why do we have to set up the baud rate also =9600??

and how we can do that ? and why did the set timeout= 0.5 ? what if timeout=0.2 ? what will be the different ?

and from where did they get "/dev/ttyAMA0" and what is stand for ?

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