Definition
A seat is the most common unit of license consumption in modern SaaS pricing. One seat typically equals one activated user, one installed device, or in the WordPress world, one activated site. Seat-based pricing is simple to communicate ("10 seats for $99/year"), maps naturally to team growth, and gives vendors a proxy for customer value without usage metering.
In the WordPress plugin world, "seat" is almost always synonymous with "site" or "activation." Freelancers buy a 1-site license. Agencies buy 25-site or unlimited-site licenses. The license server tracks how many sites have activated against a key and rejects activations past the limit. Good licensing systems also provide a way to deactivate a site you no longer own so you can reclaim the seat.
How SheetLinkWP relates to Seat
SheetLink Forms plans map seats to WordPress sites: Pro includes 1 seat, Agency includes 5 seats, Agency Plus includes 25 seats, and the Lifetime tiers offer discounted packs. When a plugin activates with your license key, the SheetLinkWP licensing API increments your active-site count. You can see and deactivate any site from the customer portal, freeing the seat for a new installation - useful when you retire a client site or migrate to a new URL.