What does “/dev/null” mean at the end of shell commands

Question

What is the difference between the following commands?

ssh myhostname "command1; command2;...commandn;" 2>/dev/null

ssh myhostname "command1; command2;...commandn;" 

1. what does 2> mean?
2. what does /dev/null mean? 

I read the result of this command will be written on the file /dev/null Instead of this console Is it right? 

It seems strange to me that my name of this file is null.

Answer 1

The 2> means "redirect standard-error" to a given file.

/dev/null is the null file.

 Anything written to it is discarded. Together they mean

 "throw away any error messages".

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