What are the real life application of absolute function?

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The well-known absolute function $|x|$ has many uses in mathematics, physics, etc. I know one of the majority applications of abs function in the alternative current making with diodes. But it is somehow an advanced application that can't understand by the student of $ k9$. Can someone make it easier to discuss, or bring me out of the darkness of illusion and tell about simple real-life application of that function?
Thanks in advance for your help