Glossary of Terms - "#'s"

480i: 480 is the lines of resolution. The letter "i" stands for interlaced scan. Associated with SDTV.

480p: 480 is the lines of resolution. The letter "p" stands for progressive scan. Associated with EDTV.

720p or 1080i: 720 lines of progressive scan or 1080i lines of interlaced scan. The resolution of High Definition broadcasts.