Amazon.com

Amazon.com, Inc. (/ˈæməzɒn/ or /ˈæməzən/), often referred to as simply Amazon, is an American electronic commerce and cloud computing company with headquarters in Seattle, Washington. It is the largest Internet-based retailer in the United States. Amazon.com started as an online bookstore, later diversifying to sell DVDs, Blu-rays, CDs, video downloads/streaming, MP3 downloads/streaming, audiobook downloads/streaming, software, video games, electronics, apparel, furniture, food, toys and jewelry. The company also produces consumer electronics—notably, Amazon Kindle e-book readers, Fire tablets, Fire TV and Fire Phone—and is the world's largest provider of cloud infrastructure services (IaaS). Amazon also sells certain low-end products like USB cables under its in-house brand AmazonBasics.

Amazon has separate retail websites for United States, United Kingdom and Ireland, France, Canada, Germany, Italy, Spain, Netherlands, Australia, Brazil, Japan, China, India and Mexico. Amazon also offers international shipping to certain other countries for some of its products. In 2011, it professed an intention to launch its websites in Poland and Sweden.

Amazon

The Amazons are a nation of female warriors in Greek myth.

Amazon or Amazone may also refer to:

Geography

People

Commerce

Amazon.com

Video

Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media.

Video systems vary greatly in the resolution of the display, how they are refreshed, and the rate of refreshed, and 3D video systems exist. They can also be carried on a variety of media, including radio broadcast, tapes, DVDs, computer files etc.

History

Video technology was first developed for Mechanical television systems, which were quickly replaced by cathode ray tube (CRT) television systems, but several new technologies for video display devices have since been invented. Charles Ginsburg led an Ampex research team developing one of the first practical video tape recorder (VTR). In 1951 the first video tape recorder captured live images from television cameras by converting the camera's electrical impulses and saving the information onto magnetic video tape.

Video recorders were sold for $50,000 in 1956, and videotapes cost $300 per one-hour reel. However, prices gradually dropped over the years; in 1971, Sony began selling videocassette recorder (VCR) decks and tapes to the public.

Prime number

A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number. For example, 5 is prime because 1 and 5 are its only positive integer factors, whereas 6 is composite because it has the divisors 2 and 3 in addition to 1 and 6. The fundamental theorem of arithmetic establishes the central role of primes in number theory: any integer greater than 1 can be expressed as a product of primes that is unique up to ordering. The uniqueness in this theorem requires excluding 1 as a prime because one can include arbitrarily many instances of 1 in any factorization, e.g., 3, 1 · 3, 1 · 1 · 3, etc. are all valid factorizations of 3.

The property of being prime (or not) is called primality. A simple but slow method of verifying the primality of a given number n is known as trial division. It consists of testing whether n is a multiple of any integer between 2 and . Algorithms much more efficient than trial division have been devised to test the primality of large numbers. These include the Miller–Rabin primality test, which is fast but has a small probability of error, and the AKS primality test, which always produces the correct answer in polynomial time but is too slow to be practical. Particularly fast methods are available for numbers of special forms, such as Mersenne numbers. As of January 2016, the largest known prime number has 22,338,618 decimal digits.

Amazon Video

Amazon Video, or Amazon Instant Video (formerly Amazon Unbox and Amazon Video on Demand in the US, and LoveFilm Instant in Europe), is an Internet video on demand (VOD) service by Amazon in the United States, United Kingdom, Japan, Austria, Germany and soon India. It offers television shows and films for rental or purchase. Selected titles are offered for free to customers with an Amazon Prime subscription, a move that angered some UK consumers when it was bundled with a non-negotiable 61% increase in the subscription fee. Like competitors, Amazon has pursued a number of exclusive content deals to differentiate its service. Most recently, Amazon reached a multi-year licensing deal with content provider HBO.

History

The US service debuted on September 7, 2006, as Amazon Unbox. On September 4, 2008, the service was renamed Amazon Video on Demand. The Unbox name still refers to the locally installed player, which as of August 2014 is no longer available for downloading purchased instant videos. On February 22, 2011, Amazon rebranded as Amazon Instant Video and added access to 5,000 movies and TV shows for Amazon Prime members. On September 4, 2012, Amazon signed a deal with pay-TV channel Epix to feature movies on their streaming service, in a move to rival their competitor Netflix. Additionally, in November 2013, Amazon premiered the comedies Alpha House and Betas, which are original series available exclusively online via the Prime Instant Video service. Amazon offered the first three episodes of both series at once for free, with each subsequent episode released weekly thereafter for Prime members.