When you sign up for a domain or start researching your domain, one thing becomes quickly clear; your domain name matters and having a keyword in your domain is often an aspect of Search Engine Optimization (SEO).
Just to define the term, a keyword can be considered any search word (or phrase) people will type into a search engine that you want to be a result for.
The role of a keyword in a domain is easy to overstate. That is, unless you’re contending for a word that doesn’t have a lot of competition, your use of a keyword in the domain is a single mote of sunshine streaming into a greenhouse — easily lost and having almost no noticeable impact.