Apps play music and videos. 
Apps on a computer play music and videos. 
Media player software is a type of app. It lets you play files like music and video. 
Some players focus on one thing. Audio players are made for music. AIMP is one example. Video players focus on films. Media Player Classic is one example. Some apps can do both. Windows Media Player is one such app.
Some players can even make a 2D video look 3D. This can happen with anaglyph processing. This is a way to make a flat picture look deep. You must wear special red and cyan glasses to see it. This method is very old. It started in the mid-19th century. Computers now make this work fast for movies.
Media player software is a special kind of application. It helps you play multimedia files like music and videos. 

Different players have different goals for what they do. Some are video players made just for digital films. For example, Windows DVD Player only plays DVD-Video discs. Other players are audio players that focus on music. AIMP is an example of a player for audio formats. Some apps can do both jobs quite well. Windows Media Player is a general-purpose player for both. It has features for music and for video files.
There is a long history of how we watch things. Computers with these skills existed in the late 1980s. The term "Home Theater PC" appeared in 1996. These are computers meant for big screens like TVs. Since the mid-2000s, many devices can now play media. Game consoles and digital media players do this too. They all help us manage our music and videos.
Many famous names exist in the world of media. You might know iTunes or VLC media player. There are also apps like Winamp and PotPlayer. Some players, like MediaMonkey, help you organize a large library. They can even find lyrics for your songs. Other players like MPlayer or mpv work on Linux. Each one offers a different way to enjoy your files.
Some technology can even change how a picture looks. You can use 3D video players to see depth. This can happen through anaglyph processing. This method uses red and cyan glasses to create an illusion. It makes flat images look like they have depth. This trick is very old from the mid-19th century. Now, computers can do this very fast in real-time.
Media player software is a type of application software designed to play multimedia files. These files typically consist of audio or video data. 
Media players vary significantly based on their specific functional goals. Video players are specialized to handle digital video content. For instance, Windows DVD Player is designed exclusively for DVD-Video discs. Other software, like Media Player Classic, can play both audio and video. However, many of its advanced features are meant for video. These include color correction, picture sharpening, zooming, and subtitle support. In contrast, audio players specialize in digital audio formats. AIMP is an example of a player that exclusively plays audio. Some software, like MediaMonkey, is built for audio consumption. It includes features like lyric discovery, music visualization, and audiobook indexing. While it can play video, doing so may be a trying feat.
General-purpose media players exist to balance both audio and video needs. Windows Media Player is one such example. It offers exclusive features for both media types, though it may not match the specialized depth of dedicated video or audio software combined. When playing video, the software typically fills the viewport. This means the video becomes as large as possible by filling either the width or the height of the screen. Users can change how the video scales or its aspect ratio. Options include stretching, cropping, or using a "100% view." In a 100% view, each pixel of the video covers exactly one pixel on the screen. Users can also zoom into the field of view using sliders or pinch-to-zoom gestures on touch screens.
Advanced software can also manipulate the appearance and sound of media during playback. This is done through various effects. Visual effects include mirroring, rotating, cropping, and cloning. Software can also adjust colors or perform deinterlacing. Audio can be modified through equalizing or visualization. Some players even include "easter eggs," which are hidden features like a puzzle game in VLC Media Player. Users can also extract still snapshots from a video frame. This is often done directly from the frame rather than using a standard screenshot. Extracting from the frame is preferred because it preserves the original height and width dimensions of the video.
Some technology can even transform 2D video into a 3D format. High-quality 3D presentations require depth information for every frame. This can be achieved by shooting video with special equipment from two different perspectives. It can also be done by modeling frames as collections of 3D vertices and textures. This is similar to how modern video games work. Because this process is costly and tedious, most movies remain in 2D. However, software can create an illusion of depth using anaglyph processing. This technique transforms a flat picture so it looks three-dimensional when viewed through red-cyan glasses. This method dates back to the mid-19th century. Recent computer advances allow this to happen in real-time during playback.
There are many well-known examples of media player software across different platforms. Windows users might use Windows Media Player, while macOS users use QuickTime Player or Apple Music. Linux users have many options, such as SMPlayer, Audacious, or the popular VLC media player. Mobile users on Android might use YouTube Music or Google Photos. Other famous names include iTunes, Winamp, PotPlayer, and foobar2000. Many of these applications also function as music library managers to help organize large collections of files.
Historically, the way we use computers for media has evolved into specialized setups. A Home Theater PC, or HTPC, is a convergent device. It combines personal computer capabilities with a media center application. These applications support video, photo, and audio playback, and sometimes video recording. While computers with these skills existed in the late 1980s, the term "Home Theater PC" appeared in the mainstream press in 1996. Since the mid-2000s, other electronics like game consoles and digital media players have also taken over media management. HTPCs are specifically defined by their use with large screens, such as televisions or projectors.
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