"You have to be born with magic in order to cast magic....although there are cases where people who have some magical abilities, but not enough to be a witch or wizard. Even if they were taught they are never strong enough and most tend to fail at a lot the more simple spells. The term for them isn't very flattering. They're called squibs."

Draco carefully worded. Before he met Jake, he didn't think nothing of it. Squibs, Muggles, Half-blood, Mudblood, etc...but when he saw how Jake felt somewhat insulted by the term he tried to be more careful. That along showed he was trying to be more considerate and was changing.

At the same time he wasn't too sure what Jake meant by the question since it was so broad.