Aqua

Aqua is the interface you see throughout the operating system and applications. It consists of a 3D bubble interface you see on scroll bars, checkboxes, general buttons, etc. It also is describes how the appearance of the interface itself functions. It uses some of the built-in graphics technologies to provide a clean, yet elegant user experience.

Dashboard

Dashboard is a background application used to display widgets. Widgets are small utilities used for simple tasks.

Spotlight

Spotlight is Mac OS X’s instant search feature. The technology uses metadata and can display search term results from specific words in a PDF, Word document, iChat chat session, name of a file, etc. It will instantly search all items on your hard drive and display the results in a simple list. Spotlight in Leopard is also capable of using boolean searches for more accurate results.

Accessibility

Accessibility is a technology that allows use of OS X for people with disabilities. It uses assistive technologies and applications to aid users with various disabilities such as hearing and vision. Voiceover was one important technology updated in Mac OS 10.5 Leopard with better streamlined voice reading and playback.