A pingback is one of four types of linkback methods for Web authors to request notification when somebody links to one of their documents. This enables authors to keep track of who is linking to, or referring to their articles.
AMP stands for Accelerated Mobile Pages, a Google-backed project designed as an open standard for any publisher to have pages load quickly on mobile devices. Google officially integrated AMP listings into its mobile search results.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.