Set some word with highlight color in emacs

If I want to highlight some words in my doc in Emacs, how can I do it.

For开发者_开发知识库 example I have a log file where I recorded some daily information. And I want to make all "TODO" in this log be highlighted.

How can I do it?

Thank you in advance.

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You should take a look at this thread :

How to highlight all occurrences of a word in an Emacs buffer

This blog entry also describes a simple way to do it :

http://emacs-fu.blogspot.com/2008/12/highlighting-todo-fixme-and-friends.html

The best way to implement this depends on what you want exactly : you can toggle highlighting manually, or create a hook that will do it for any mode.