Without trying to spark another editor war, here is a summary of characteristics:
uses more memory
has more features and is extensible via plugins
ported to nearly every operating system
was written by Richard Stallman, founder of the Free Software Foundation
uses less memory
has fewer features
found on nearly every Unix and Unix-like system
even it's creator doesn't use it anymore
have thousands of die-hard fans
use arcane keyboard shortcuts, making it nearly impossible for the untrained to actually type something (hint: use nano).
There are many types of text editors are present. vi, pico, emacs, notepad, nedit, wordstar
Not sure what you mean by enter a file; you could use an editor, such as vi, emacs, nano, pine, etc. to edit it.
EMac was created in 2002.
There are many places where one can find information on using Emacs on Windows. One can find information on using Emacs on Windows at popular on the web sources such as GNU and Emacs Wiki.
apt-get install emacs
Since Emacs is an programmable editor it would be difficult to find paid project based work based solely on Emacs alone.
Some may think that the vi editor is too cryptic in its use of commands; i.e. it is not very intuitive in terms of doing edits. Other editors seem to allow users to 'take' to them in an easier fashion. However, if you use it long enough it becomes (like anything else) second nature.
vi, vim, emacs, and pico are the most popularly available text editors on Unix systems. There are many more, of course, but these seem to be the most common.
Translogic - 2010 Japan VI Better Place was released on: USA: 14 February 2011
type in emacs -batch -l dunnet
Emacs was developed by Richard Stallman in the mid-1970s while he was working at the Massachusetts Institute of Technology (MIT). It was originally created as a set of macros for the TECO text editor but evolved into a standalone, extensible text editor. Stallman later founded the Free Software Foundation and promoted the concept of free software, which Emacs embodies. The editor has since been further developed by many contributors and has numerous variants, the most notable being GNU Emacs.
vi = 6 is already rounded to a greater extent than that.