Sanctification

Holiness, Sanctification, and Consecration

What is holiness? I see a picture of some saint in my head, holding up three fingers, alone on a hill, staring longingly up at the sky, with a halo around his head (sometimes her head, but mostly his head). Or, are we talking about "His Holiness, the Pope?" Or, something set aside for a specific purpose? Or, is that sanctification? Is it the same thing?