underscore or hyphen in Domain name

[Girish singh]

Should I use underscore or hyphen in URL'S or Domain name.

[aep007]

use Hyphen or underscore not really good for domain name. the most better for domain name use one phrase:
example:
earthorbit.com most easy to type/remember than orbit-earth.com

[Jim Gillum]

hyphens are just fine.....engines do not read them anyway...

[pettersiddle]

dont use hyphen or underscore there is lots of difference in this

for example site 1 shareusall is different from site2 share-us-all

most of the people consider site 2 as spam

[kuanlkumar]

Having dashes (-) in domain have no significant impact on rankings in Google. So it's okay to have hypen in domain, not a big issue though. But if user were to type you're domain name directly they might feel lazy to type(-).

[arianagrand]

If your business model means you attract visitors by word of mouth, use of hyphens can be an issue. Your website needs to have a catchy name that customers will remember easily.

[SolaDrive]

I think hyphen is easier to type compared to using underscore.
I'm sure everyone would find hypen easy to work with than using underscore.

Having to type an underscore might put some people off, that's some traffic you are losing..
Moreover, it's easier to remember an hyphen than an underscore (my opinion though based on experience)

[Sumit]

Use hyphen as it recommended and loved by the SE too.