What is the .realestate domain?

The .realestate domain is a top-level domain that ends in .realestate, in place of other extensions such as .com, .net, .org or .realtor™.

For example:

Ends in .com – househunters.com, jerrysanden.com, tribeca.com
Ends in .realtor™ – househunters.realtor, jerrysanden.realtor
Ends in .realestate – househunters.realestate, jerrysanden.realestate, tribeca.realestate