UI - User Interface. This term is used to describe a system of interactive elements between users and their computers. It usually indicates the items on a screen with which a user is directed to interact with.
CSS - Cascading Style Sheets is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can also be applied to any kind of XML document, including plain XML, SVG and XUL. See the CSS entry on Wikipedia for more information.
JPEG - Joint Photographic Experts Group image format. Also commonly referred to as JPG, JPEGs are image files that have been compressed to reduce their file size. JPEG compression is a one-way form of lossy compression in which the quality of the file degrades the more it is compressed. JPEG files typically achieve around a 10:1 compression ratio before displaying a perceptible loss in quality.
HTML - HyperText Markup Language. HTML is the markup language used to display web pages in a web browser. See the HTML entry on Wikipedia for more information.
QR Code - Quick Response Code. It is a two dimensionial matrix bar code. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text a URL or other data. It is most commonly used with smart phones.
SEO - Search Engine Optimization. The practice used in website development to help "get you found" on search engines like Google, Yahoo etc.
URL - Uniform Resource Locator. Technically speaking, a URL is a character string that corresponds to an internet resource. A URL typically corresponds to a web address (i.e. www.yourcompany.com/about-us) that can be typed into a web browser.
WYSIWYG - What You See Is What You Get. Often used to describe a text editor such as the WYSIWYG control.
XML - Extensible Markup Language is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The design goals of XML emphasize simplicity, generality, and usability over the internet. See the XML entry on Wikipedia for more information.