What Does It Mean When My HP Printer Says Attention Required?

My printer was working fine in the morning but now it is saying attention is required. I have tried some basic troubleshooting to fix it but nothing works for me. I bought my printer six months ago, so disappointed with this error message. Any suggestions to fix this issue always appreciated. I don’t understand- What does it mean when my HP printer shows the attention required?
Response by [Kelvin Morton]
First of all, thank you for sharing your error message. You don’t need to worry about this error message as you can fix it easily. This attention notification mainly occurs due to low ink levels, outdated firmware, improper functioning of the spooler, and pending Windows updates.

Please follow the detailed article to fix HP printer says attention required.