An Exact Match Domain, or EMD, is a domain that matches a search phrase perfectly. Spaces and special characters are left out of EMDs
Example: For the phrase "buy tablets online" the Exact Match Domains would be buytabletsonline.com, buytabletsonline.net, or buytabletsonline.org. Other domain extensions can be used, but those are the most common.
SERP Scan has an Exact Match Domain Finder - click here to learn more about it.