No, you didnt search too well lol... The truss rod is an adjustable metal rod running down the middle of the guitar neck. It holds the neck straight and prevents the tension of the strings from pulling the neck up and bending it. It allowed companies to build guitars with thinner necks that are easier to play without the necks bending a ton (they used to have to be super thick and hard to play just so they wouldn't bend). And you can adjust it if you want to slightly adjust the bend in your neck. You tighten the nut connected to the truss rod if you want to straighten your neck, you loosen it if you want to allow the neck to bend with the strings a bit more.