What is an exact-match domain?
An
exact-match domain is a domain name that includes the keyword phrase itself. Some people call them Keyword Domains
For example, let's say your new business wanted to rank for the keyword "awesome cheap widgets". If you chose an EMD, your website would look like this:
www.awesomecheapwidgets.com
It sounds like a great strategy on the face of it. More keywords, more SEO, right?
Not exactly.
Back in the day—2012 to be exact—Google noticed that a lot of websites were trying to improve their SEO by choosing exact-match domains. Back then, if you wanted to rank for "cheap Nokia phones," no problem! You would just buy the domain,
www.cheapnokiaphones.com, for a few bucks, and presto! You would win first-page ranking.
No backlinks. No quality content. Just raw SEO power!
In response, Google dropped a bombshell. It was called the Exact Match Domain Update.
Read this for more info
https://www.searchenginejournal.com/choose-a-domain-name-maximum-seo/158951/