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What is meant by 'output to stdout'

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http://stackoverflow.com – New to bash programming. I am not sure what is meant by 'output to stdout'. Does it mean print out to the command line? If I have a simple bash script: #!/bin/bash wget -q http://192.168.0.1/test -O - | grep -m 1 'Hello' it outputs a string to the terminal. Does this mean it's 'outputting to stdout' ? Thanks (HowTos)