Domain Authority is SEOmoz’s numeric number which shows overall link authority of domain name. This is popular parameter among webmaster to measure reputation of domain. Higher the domain authority, the domain is more trusted.
Its important that you should also check the page rank of the domains while checking DA. If a domain has higher authority and not indexed in Google, there is no use of such domains links or value.
Why Domain Authority is important
Domain Authority parameter is calculated based on many factors. Its has become more important due to recent Google Penguin update as well where algorithm force to remove low quality links. DA helps to identify high quality domains, Any domain can have high PR or Fake Page Rank, while DA is calculated each month based on quality factors and linking root domains. So you need to check domain authority of each link to avoid low quality links. You can check Domain Authority and Other parameters at Open Site Explorer. Our this tool will check DA and Page rank for Bulk Domains.
This tool support URL’s up to 200 at once!.