system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The difference between 1080i and 1080p

While you're at it, whats the difference between 1080, 720, 480, etc.?
gpt
They're names for different screen resolutions, with the number indicating the number of horizontal scan lines, i.e. 1920 x 1080, 1280 x 720, 640 x 480, etc. The i and p mean interlaced and progressive, respectively. What this means is that with 1080i, every other horizontal line is drawn, thus saving computation time and especially video size. In 1080p, *every* horizontal line is drawn. With a still picture, most people cannot tell the difference between 1080i and 1080p. With a moving video or games, however, the difference between the two becomes far more apparent. 1080p is very noticeably more clear in fast motion.