An exact-match domain is one in which the domain directly corresponds with the firm's primary brand.
For a hypothetical venture firm named Northstar Ventures, examples might include:
Northstar.com
Northstar.vc
NorthstarVentures.com
Shorter isn't automatically better, but an intuitive exact-match domain can provide several advantages:
Memorability — fewer words for someone to remember.
Clarity — a direct relationship between the firm's name and web address.
Professional presentation — particularly when the domain is used for email.
Brand consistency — across websites, presentations, portfolio announcements and communications.
The value of these advantages depends heavily on the individual brand.