an alphabetical list of words relating to a specific subject, text, or dialect.

Algorithms decide which decides the ads position when a user searches something in the search engine

Determines how quickly your ads will show. Google AdWords offers two choices for ad delivery - accelerated and standard (default). 

Ad serving method that shows your ads as quickly as possible with no regards to spacing out your budget.

AdWords default ad frequency where ad impressions are being served to balance your campaign budget.

Ad Extension gives additional information with the ad copies giving users more reason to choose or click on your Ad like showing your store address (location extension), your contact number (call extensions) direct people to specific pages (sitelinks...

An ad group contains one or more ads which target a shared set of keywords/placements/topics/interest or remarketing list.

A tool within Google AdWords that allows you to check and troubleshoot whether your ads are showing up on Google search or not

Ad rank determine your adposition on SERP.
Ad rank = CPC X Quality Score X Format impact(Impact that Extensions will have on your CTR)

Relevancy of your ad headline, description, keywords and destination url. It measure how closely related your keywords is to your ads.

If you have multiple ads, the ad rotation settings help you decide which ads should be showed most often to potential visitors.