curl hide progress bar output on Linux/Unix shell scripts

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I am a new Ubuntu Linux user. I am writing a shell script and using the curl command to grab URL output using curl$key/hash.html. However, the curl command is outputting complete progress information that my script does not need it. How can I get curl command not to show the progress bar output? How can I hide curl command output? Is there is a simple way for silencing curl’s progress output on an Ubuntu Linux desktop?