Browser
has multiprotocol support
- HTTP, FTP, LDAP, GOPHER, NNTP, SMTP, POP, ...
can automatically launch helper application (viewer) to handle some data formats (sound, video, postscript, MS applications, ...)
“plug-in” extensions can be used to extend browser capabilities (3D animation, various graphics formats, ...)
has it’s own cache (memory and disk)