What is the difference between 1080i and 1080p?

In the early days of television broadcast companies solved the problem of bandwidth capacity by transmitting only half the video lines of each video frame 60 times per second. Because it was so fast you eye preserves two frames as one which completes the frame. This is interlaced frames which is designated by the “i” after the number of lines of resolution. 1080p or progressive contains the full image in each frame and therefore look sharper and is much easier to work with in post-production environments.