under the hood
(figuratively) Beneath the surface; in its internal workings.
Internet search engines are easy to use, but there's a lot going on under the hood.
A leader is the one who can outline the broad vision and the direction, and say here's where we are going to go, here's why we need to go there, and here's how we are going to get there. A manager is the one who actually gets up under the hood and tunes the carburetor. Mike Huckabee
DNS is kind of the hamster under the hood that drives the Internet. David Ulevitch
We found a way to make things look great to the human eye through the window of a graphical web browser without worrying about what everything looked like under the hood. Mike Davidson
I think if you were to really peek under the hood of what got Aerosmith back again for our second life in the Eighties, you'll find out that it's exactly this, it's the willingness to take a risk. Steven Tyler
You know, I do music. If you look under the hood of the industry I'm in, it's all based on technology. From radio to phonographs to CDs, it's all technology. Microphones, reel-to-reels, cameras, editing, chips, it's all technology. will.i.am
Under the hood, both the smartphones have an octa-core Exynos 9611 mobile platform, coupled with up to 8GB of RAM and 128GB of storage. Source: Internet