Alexa (Amazon Alexa) – Amazon’s home assistant device that uses voice commands to do various things like: play music, answer questions, give weather updates, and more. Voice search is becoming more interesting to the SEO industry as more people use devices like Alexa in place of computers for searches.

Alexa Traffic Rank is a key metric published from Alexa Internet analytics is the Alexa Traffic Rank also simply known as Alexa Rank. It is also referred to as Global Rank by Alexa Internet and is designed to be an estimate of a website’s popularity.

As of May 2018 Alexa Internet’s tooltip for Global Rank says the rank is calculated from a combination of daily visitors and page views on a website over a 3-month period.

An algorithm is a specification to solve a class of problems. Algorithms can perform calculations, data processing, and automated reasoning tasks.
A set of criteria or rules used to rank websites in search results. Often referred to as the Google Search Algorithm.

The alt text attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text (alt text) that is to be rendered when the element to which it is applied cannot be rendered.

The alt attribute is used by “screen reader” software so that a person who is listening to the content of a webpage (for instance, a person who is blind) can interact with this element. Every image should have an alt attribute to be accessible, but it need not contain text.