what is demilitarized zone (DMZ)

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Dear Experts koi mujh demilitarized zone(DMZ) k baray mai batayain ya Network mai kis purpose k liya use karty hain.

Thanks

[bais]

ye basically ik aisa tool hai ye optin hai jo router ma hoti hai aur ye ap k network ko dusrae untrusted network yani Internet se connect karti hai.....ye option security k liya bohat mofid hai q k is se koi b hacker sirf ap k router tak hi access kar sakhta hai us se agae nahi jis se ap k network secure rehta hai.....

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Thank you so much.