What is an inequality? and when would you use them in the real world?

I need to buy 3 things and the shopping total needs to be less than or equal to $5 because that is all the money that I have.

$$a+b+c\le\;5$$

An inequalitie is when two numbers aren't equal,  or two equations.

Okay thanks and would I use them in the real world like when I go shopping for food?

Okay thanks Melody and Happy7 you both helped me a lot!

Oh no sweat