Search Engine Marketing & Sponsored link [SEM]
Pay Per Click (PPC). An advertising campaign is designed to help you to achieve your search engine marketing (SEM) objectives. It's a prepaid service where Paid Amount gets deducted when click occurs on link.
Impressions: Number of time each page load to give you a view of that page.
Landing pages: Instead taking a visitor from the search result link to your website, searcher will directly land in a page of relevance what he is looking for