What are EMD (Exact Match Domains)?
“An EMD is a domain name that precisely matches a search query that will likely drive traffic to your website. For instance, if you call your website BuyCheapJeansOnline.com.
The search query ‘buy cheap jeans’ is a lucrative search term, and if you call your website this then you might assume this is a short cut to the top of a search engine results page (SERP).
Source: What is an exact match domain (EMD) and how can you safely use one? | Search Engine Watch“.
Should you use them? Yes, you can still use them, but their value is declining, and you might want to consider going for a branded name in your domain.