Progressive Video Scans (sometimes referred to as noninterlaced
scans) is a display standard that renders all of the vertical lines of
resolution in a video picture at one time. The format utilizes the faster
processing speeds of newer television systems to render a smoother,
yet more detailed and filmlike image, addressing problems inherent
in the older interlaced scan format.

Progressive scanning is commonly used in Blu-ray Discs and in a very
few DVD home video products.

Progressive video scanning is preferred over interlaced scanning.
Many current HD systems (disc players and HD monitors) are capable
of converting an older interlaced signal into a progressive signal
(commonly known as line doubling). We heartily recommend line
doubling interlaced DVDs of silent films to create a more filmlike
picture.

More details on progressive video scans may be found on Wikipedia.