Interval Training vs. HIIT: What's the Difference?

[b]Are interval training and HIIT the same? Not quite![/b]While both involve work and rest periods:[list][*][b]Interval Training:[/b] A broader term for any workout with alternating periods of effort and recovery.[*][b]HIIT:[/b] A specific type of interval training characterized by *maximal or near-maximal effort* during work periods, followed by *short, incomplete recovery*.[/list][quote]"All HIIT is interval training, but not all interval training is HIIT."[/quote]Which style do you use more?