What is Less Than Conditional Formatting?

What is Less Than Conditional Formatting?

In Conditional Formatting Less than feature highlight those cells' or value that is Less than a certain number define by us while applying Less than tools.

Please follow the below pictures.

Click on conditional formating > Highlight cell rules > Less Than rules.

excel conditional formatting formula less than

By click on Less Than Rules new window open like below image and you could put value such as I want to highlight (Yellow Fill With Dark Yellow Text) those values which are Less than 45 from the cells. 
Note: You can use more than one conditional formatting on specific columns, rows or Values.