From Webkinz Insider Wiki
A full membership is a basic Webkinz World membership. Full memberships are gained through the adoption of a Webkinz pet. After the adoption date, the account lasts one year, before it becomes an Alumni Membership. It does have a lot of benefits but not as much as Deluxe Membership accounts. Many users have a full membership on their webkinz world accounts. As a full member you can access most features on Webkinz World but you cannot access some features like the Deluxe Membership gift boxes every month or access to special Deluxe Membership only arcade games and features. Full membership has always been the most common membership in Webkinz World. It was the only webkinz world membership available for Webkinz World users until April 1, 2009 when the Deluxe Membership was introduced to Webkinz World.