What's the summary on the back (or on the flap jacket) of a book called?

[John Dishon]

Is there a specific term, or is it just called a summary?

[Pepper Smith]

I've seen it called jacket copy or back copy.

[Jude Hardin]

I call it flap jacket copy.

[Pat Bertram]

It's usually called a blurb.

[Lindy Cameron]

It's a blurb; or a back cover blurb.

[Jessica]

I call it Bill. 'Blurb' is like, so mainstream...