Web Technology Definitions

ASP.NET
A Microsoft technology that includes programming tools for building dynamic, data-driven websites and desktop applications. Typically found in larger corporate environments, as the tools and systems to support it can be expensive.
CSS (Cascading Style Sheets)
A feature of HTML that allows for the layout and visual styles in a web page to be defined in a separate file from the actual content. This allows easy updates for sites and 'global' styles to be defined for an entire website from a single source.
Flash
Web animation software, used for creating web content rich in video and audio, with dynamic user interfaces.
Javascript
A browser scripting language, most often used in enhancing user experience with web pages.
MySQL
Very popular database system for web development. It is open-source, which means it is free, which explains the popularity. Often included with webhosting packages and inegrates well with PHP.
Photoshop
Very popular photo and graphics editing software. Pretty much the industry standard.
PHP
(Hypertext Preprocessor) - A programming language created for building dynamic, interactive web pages. PHP is very popular with web developers because it is free and well supported.
SEO
Search Engine Optimization - The voodoo behind getting your site to appear on the first page of Google, Yahoo, etc... Ideally this is where you want to be. Depending on your site's purpose, this can be a very competitive aspect of existing on the web, and can make or break your site.
SQL
(Structured Query Language) - In short, a database language for interacting with databases. Commonly used as a term to describe the Microsoft SQL database technology.
Web Standards
A movement towards standardizing the way browsers display web pages. The W3C website contains all you ever wanted to know about it.
XHTML
A combination of XML and HTML. Integrates well with CSS and Javascript.