curl hide progress bar output on Linux/Unix shell scripts

Originally published at: https://www.cyberciti.biz/faq/curl-hide-progress-bar-output-linux-unix-macos/

I am a new Ubuntu Linux user. I am writing a shell script and using the curl command to grab URL output using curl https://example.com/data/api/$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?