Landing Pages is a type of report from within Google Analytics that shows you where people are arriving into your site, and which of your pages in particular is reporting the best stats. This can be used to track the performance of various blog posts, for example, allowing you to track which pages are bringing in the most traffic, holding on to visitors for the longest duration, or with the lowest bounce rate, so you can apply the best elements of your successful pages across the board. With goals being tracked, you can also switch this to show by conversion rate, so you can benchmark your entire website to the successful aspects of your best page.
