Are these songs dubstep?

Those are brostep. Brostep tends to have a "poppy", loud, commercialized sound. Brostep tends to have a lot singing in it as well. This music is not for relaxing.

Dubstep is dark, laidback, and trippy music; and may have a little to medium Jamaican influence. Dubstep can also be very minimalistic and jazzy, too. Dubstep came out of UK/2-Step Garage in the late '90s-early '00s, so their influence may seem a bit similar to dubstep. Rule of the "dub-" prefix: perfect music to listen to while stoned.

Examples of dubstep (mostly from Deep Medi Musik's label)

http://www.youtube.com/watch?v=FL_gFzPLoMg

http://www.youtube.com/watch?v=OP4Mxe69RTc

http://www.youtube.com/watch?v=lAtz_Vw5AjQ

http://www.youtube.com/watch?v=HhbfoKMMRUs

http://www.youtube.com/watch?v=YTRvzDooI88

http://www.youtube.com/watch?v=Vc0f-9HomaY

http://www.youtube.com/watch?v=u2S8Nccavg8

http://www.youtube.com/watch?v=U4uF2TFwtgI

http://www.youtube.com/watch?v=9fePcmU8drI

http://www.youtube.com/watch?v=CdTzrfFo0GA

Brostep, and the person who answered before, Skrillex is Brostep as well. America's perception of what dubstep actually is, is way off. I'm American, I'm allowed to make these claims, I deal with a lot of people in the EDM fanbase.

I would think that these are dubstep, but if you want to know the difference between different genres and dubstep itself, then listen to this link. (This link is dubstep, and you have to listen to at least most of it)

https://www.youtube.com/watch?v=k6lVhGeyXuw