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iking

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Anyways, I am doing a research related to Ising Model

My question is about the energy in Ising Model

the following statement is written in "History of the Lenz-Ising Model" paper:

"when two neighboring spins are the same (both +1 or -1) the energy is -U,

and when two neighboring spins are different, the energy is +U. In other words,

the interaction tends to make neighboring spins the same"

I know that my question is dumb, so please forgive me for that,:

what does a negative energy means?!! and why a negative energy means

the interaction tends to make the neighboring spins the same?

Please forgive me for such questions.

Thanks