ActiveX controls
Reusable software components that incorporate ActiveX technology. ActiveX controls can be embedded in Web pages to produce animation and other multimedia effects, interactive objects, and sophisticated applications.

They can be written in a variety of programming languages, including C, C++, and Visual Basic.

Animated GIF
A file containing a series of GIF (Graphics Interchange Format) graphics that are displayed in rapid sequence in a Web browser, giving the appearance of a moving picture.

Anonymous FTP
The ability to access a remote computer system on which one does not have an account, via the Internet's File Transfer Protocol (FTP).

Users have restricted access rights with anonymous FTP and usually can only list, view, or copy files to or from a public directory on the remote system. Many FTP sites do not permit anonymous FTP access in order to maintain security. See also FTP.