- 240p: The popular term for a display or video with 320×240 display resolution. 240p is used most often used in mobile phones, PDAs, and some handheld game consoles. This was used during the Play Station 1 era of console gaming. Known as QVG
- 320p: For screens have 480x320 pixels. This format is used by a variety of PDA devices in 2002, as is an outdated format for video. Known as HVGA.
- 480p: This is known as "Enhanced Definition", at the resolution I'm sure you've heard of: 640x480. You'll find this as the default setting when watching Youtube videos.
- 720p: Typically used at 1280x720, This resolution you'll find on many smaller or older TVs, as well as portable class laptops. This is the first resolution considered "High Definition". If you watch HDTV through your cable company, it's most likely at this resolution.
- 1080p: Used most often for wide screen, high end monitors for laptops and desktops, as well as LCD TVs. Blu-ray is in this format (1920x1080), as well as high end performance laptops. Very few video outputs are in this format, as the files are extremely large. Youtube up until recently, had 1080p as their highest format.
- 4k: Not the best resolution out there, but the best you'll find streaming over the internet. Youtube recently introduced this format as their new "top of the line" format. Known as HSXGA (Hex Super Extended Graphics Array). This is approximated 10x larger than 1080p. That's a huge file! But in return for the file size, Colors are pristine, and there is absolutely zero pixelation (If you have the monitor to take advantage of it!
So now that you have at least a brief idea of where these resolutions come from, you can now see the difference in what they are. There are very few videos in the 4k (called "Original" by youtube) available, as most people don't have cameras or recording methods that support this resolution. Check out the difference on your favorite streaming video, it's worth the extra buffering time for the quality!
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