I want to know that if i make a site with the name www.abcandcompany.com there no any badness in seo.... If i make www.abc-and-company.com so it make any difference in SEO? " - " break the SEO?
In terms of domain name, I'm not sure, I haven't had any domain with hyphen, however the I've tried with and without hyphen in url of the page, I personally don't think they will make any differences.
Matt Cuts in his video approves and suggests using hyphens in domain names and url-s, who would know this better!
This will not make any difference if you will add quality content and provide good services with a better SEO.
Better go for without dash,,,! form my view..! Do good seo, don't go for spamming and link buying..! Previously url's with dashes had high priority, but now it changed...!