Yui may refer to:
Yui (ゆい, ユイ) is a feminine Japanese given name which can also be used as a surname.
Yui can be written using different kanji characters and can mean:
The given name can also be written in hiragana or katakana.
Yui (born March 26, 1987), stylized as YUI, is a Japanese singer-songwriter, multi-instrumentalist, and actress. Born and raised in Fukuoka prefecture, she played live at various locations in her hometown before being noticed by Sony Music Japan when she was 17 years old, and released her debut single months later. However her singles were only met with moderate success until her breakout "Good-bye Days", which charted for 44 weeks on Oricon and marked her as one of the Japanese music industry's rising stars.
Since her debut album, From Me to You, each of her albums has topped the charts, and has had at least one single reach number one yearly since 2007, including five straight from mid-2008 to late-2010.
She is popular in Japan and in surrounding countries, ranking number one in 2011 Count Down TV "Dearest Female Artist" and Music Station "Artist You Most Want to Marry" polls, as well as Radio Television Hong Kong's "Most Popular Japanese Artist".
After retiring from music as a soloist in 2012, she formed the band Flower Flower in 2013.
The Yahoo! User Interface Library (YUI) is a discontinued open-source JavaScript library for building richly interactive web applications using techniques such as Ajax, DHTML, and DOM scripting. YUI includes several core CSS resources. It is available under a BSD License. Development on YUI began in 2005 and Yahoo! properties such as My Yahoo! and the Yahoo! front page began using YUI in the summer of that year. YUI was released for public use in February 2006. It was actively developed by a core team of Yahoo! engineers.
In September 2009, Yahoo! released YUI 3, a new version of YUI rebuilt from the ground up to modernize the library and incorporate lessons learned from YUI 2. Among the enhancements are a CSS selector driven engine, like jQuery, for retrieving DOM elements, a greater emphasis on granularity of modules, a smaller seed file that loads other modules when necessary, and a variety of syntactic changes intended to make writing code faster and easier.
The YUI Library project at Yahoo! was founded by Thomas Sha and sponsored internally by Yahoo! co-founder Jerry Yang; its principal architects have been Sha, Adam Moore, and Matt Sweeney. The library's developers maintain the YUIBlog; the YUI community discusses the library and implementations in its community forum.