The Internet is a connected network of computers around the world that can be used to access the World Wide Web. (The World Wide Web was created at CERN in Switzerland in 1990 by a British scientist named Tim Berners-Lee.)

The Internet provides a variety of information and communication facilities, such as mail services, web pages, social media, online gaming, or downloading files.

The Internet was developed in the United States by DARPA, it was first connected in October, 1969, and was called "arpanet". The term "internet" was adopted in December 1974, as an abbreviation of the term InterNetworking (the model using TCP/IP protocol).


The term "high-definition" is commonly abbreviated as "HD" and is used to express a technology that has a much clearer picture and/or sound than standard definition (SD).

SD has a resolution of 640 × 480 (307,200) pixels, aspect ratio 4:3
HD has a resolution of 1920 × 1080 (2,073,600) pixels, aspect ratio 16:9
Ultra HD (UHD 4K) has a resolution of 3840×2160 (8,294,400) pixels, aspect ratio 16:9

The number of pixels determine the quality of the image. The higher the pixel count, the more detail that you can possibly get.