The Schengen Zone is a group of European countries that have abolished passport and other types of border control at their mutual borders. As of my last update, Croatia is not a full member of the Schengen Zone, but it does apply certain Schengen rules as part of its EU accession process. This means that if you have a valid Schengen visa, you may be able to enter Croatia without a separate visa for short stays. However, it's important to confirm the current status and requirements.