impression – A single instance of an online advertisement being displayed
impression share – The percentage of impressions your ads received compared to the number of impression your ads were eligible for.
inbound marketing – A marketing model whose sales performance relies on the initiative of its client base to find and purchase a product.
incentivized traffic – Visitors who have received some form of compensation for visiting a site.
internal link – A hyperlink from one page on a website to another page or resource on the same site.
interstitial – An advertisement that loads between two content pages.
invisible Web – a.k.a. deep web – the portion of the Web not indexed by search engines.