It's just that... a white room. Or, at least, partially so.
It's what's called a cyc (short for cyclorama). The cyc is built like the corner of a room, except there are no edges where the floor meets the walls. They're curved for a seamless background. After that, even lighting to keep background shadows away will maintain the effect.
or film in front of a white wall and boost the contrast up so it looks really crisp i did these interviews for a project and i just did the contrast thing and it looks like this
Still doesn't create the same, pure white of the seamless background. The lighting is uneven, especially towards the upper right of the frame. Honestly, it looks like an egg-shell white (household) wall. And pushing the contrast lost detail in the black jacket. It also looks like you had no other lighting than what was in the ceiling.
Back to the OP, if you just want white in the background and aren't looking for a wide frame, you can shoot against a white wall, green screen, whatever. But since you cite the Apple commercials, I assume you're talking about a full-body frame. To have the subject standing on a white floor with a seamless background, it needs to be a cyc.
Whatever you do, get a lighting kit. Cover the background for even lighting, and make sure to get a key and back light on the subject.
I'm working on one of these shots RIGHT NOW actually.
This is how I'm getting it:
1. 10' high 12' wide backdrop frame.....$139.00
2. White cloth backdrop doubled over for two layers and IRONED TO DEATH! .....$90.00
3. 2 1200Watt halogen lights at about 4 feet high reflected off a 5-foot diameter umbrella, each at about 35 degrees to subject.
4. 4 additional 100Watt fills to even things out and keep faces bright.
It's ALL about the lighting. It's gotta be really full, even, and diffused to avoid sharp shadows.
When I white balanced on the fabric the backdrop went pure white.
I recently did a video that had something close to what your trying to get..i used a white sheet and over exposed it!I used 80% matrix as it caters for skin tones.