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    <p>Both are valid URL characters and both have their pros and cons.</p> <p><strong>Pro dash</strong></p> <ul> <li><p><a href="http://www.google.com/support/webmasters/bin/answer.py?hl=en&amp;answer=76329" rel="nofollow noreferrer">Google recommends dashes</a>, and here is what Matt Cutts from Google has to say about <a href="http://www.mattcutts.com/blog/dashes-vs-underscores/" rel="nofollow noreferrer">Dashes vs. underscores</a>.</p> <blockquote> <p>If you have a url like word1-word2, that page can be returned for the searches word1, word2, and even “word1 word2″. That’s why I would always choose dashes instead of underscores.</p> </blockquote></li> <li>Dashes seem to be what major blogs do: <a href="http://www.huffingtonpost.com/" rel="nofollow noreferrer">The Huffington Post</a>, <a href="http://www.techcrunch.com/" rel="nofollow noreferrer">TechCrunch</a>, <a href="http://www.engadget.com/" rel="nofollow noreferrer">Engadget</a>, ...</li> <li><strike>Dashes seem to be what major CMS do.</strike><br/> <em>Not sure about that one anymore, can anyone comment?</em></li> <li>As mentioned by <a href="https://stackoverflow.com/questions/929329/whats-the-best-character-to-represent-blank-spaces-in-a-url/929341#929341">Kazar</a>, underscores can clash with the underlining of links.</li> <li>I find underscores awkward to type.</li> <li><a href="https://stackoverflow.com/questions/929329/whats-the-best-character-to-represent-blank-spaces-in-a-url/929526#929526">Rene Saarsoo</a> pointed out that dashes take less space than underscores in proportional fonts.</li> <li><a href="https://stackoverflow.com/questions/929329/whats-the-best-character-to-represent-blank-spaces-in-a-url/929429#929429">Ionut G. Stan</a> mentioned that <a href="http://en.wikipedia.org/wiki/Domain_name_system#Internationalized_domain_names" rel="nofollow noreferrer"> underscores are not allowed in hostnames</a>. If you strive for consistency you should opt for dashes.</li> </ul> <p><strong>Pro underscore</strong></p> <ul> <li>Dashes are not allowed in <a href="http://en.wikipedia.org/wiki/ISO_9660#File_and_directory_name_restrictions" rel="nofollow noreferrer"> ISO9660</a> file systems. This can be a problem if your content is also shipped on DVD or CD (e.g help files or eLearning content).</li> <li>In some languages (e.g. German) dashes can be word characters and are not generally considered word separators. </li> </ul>
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    1. POWhat's the best character to represent blank spaces in a URL?
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    1. COA lot of CMSs allow you to choose. For example, I know that Drupal lets you specify explicity the path seperator. However, it is worth pointing out that the default they use is indeed dashes. EzPublish also defaults to dashes, I believe, but does let you choose.
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    2. CODashes are usually used inside "joined words" (also in English, like "URL-friendly"). But they are rare enough and most of the time the meaning will not get lost when you have word-with-dash-inside-words-just-separated-with-dash.
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