Very confused on the meaning of this…!

I just want a wig to throw over my head and leave the house, lol! The measurements are confusing me.

What is a lace frontal?? Is that just a piece of hair like a toupee?? I’m so embarrassed asking this I do not know about hair at ALL 😭 and what is a 4x6 precut?? Is that the shape of a head?