YouTube is an American video-sharing website headquartered in San Bruno, California.

The service was created by three former PayPal employees—Chad Hurley, Steve Chen, and Jawed Karim—in February 2005.

Google bought the site in November 2006 for US$1.65 billion; YouTube now operates as one of Google's subsidiaries.

The site allows users to upload, view, rate, share, add to favorites, report and comment on videos, subscribe to other users, and it makes use of WebM, H.264/MPEG-4 AVC, and Adobe Flash Video technology to display a wide variety of user-generated and corporate media videos.

Available content includes video clips, TV show clips, music videos, short and documentary films, audio recordings, movie trailers and other content such as video blogging, short original videos, and educational videos.

A film, also called a movie, motion picture, theatrical film or photoplay, is a series of still images which, when shown on a screen, creates the illusion of moving images due to the phi phenomenon.

This optical illusion causes the audience to perceive continuous motion between separate objects viewed rapidly in succession.

The process of filmmaking is both an art and an industry.

A film is created by photographing actual scenes with a motion picture camera; by photographing drawings or miniature models using traditional animation techniques; by means of CGI and computer animation; or by a combination of some or all of these techniques and other visual effects.

In a modern sense, comedy (from the, kōmōidía) refers to any discourse or work generally intended to be humorous or amusing by inducing laughter, especially in theatre, television, film, and stand-up comedy.

The origins of the term are found in Ancient Greece.

In the Athenian democracy, the public opinion of voters was influenced by the political satire performed by the comic poets at the theaters.

The theatrical genre of Greek comedy can be described as a dramatic performance which pits two groups or societies against each other in an amusing agon or conflict.

Northrop Frye depicted these two opposing sides as a "Society of Youth" and a "Society of the Old".

A revised view characterizes the essential agon of comedy as a struggle between a relatively powerless youth and the societal conventions that pose obstacles to his hopes.

In this struggle, the youth is understood to be constrained by his lack of social authority, and is left with little choice but to take recourse in ruses which engender very dramatic irony which provokes laughter.

Music is an art form and cultural activity whose medium is sound organized in time.

The common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics (loudness and softness), and the sonic qualities of timbre and texture (which are sometimes termed the "color" of a musical sound).

Different styles or types of music may emphasize, de-emphasize or omit some of these elements.

Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment) and pieces that combine singing and instruments.

The word derives from Greek (mousike; "art of the Muses").

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