.LTDA is a regulated gTLD administered by the Afilias registry.
LTDA is the abbreviation for "limitada," the legal form for limited liability companies in certain Latin American countries.
Registration details can be found in the TLD reference chart.
The purpose of the .LTDA gTLD is to specifically serve the interests of Latin American companies using the legal form "LTDA". "Latin American" in this context is defined as:
.LTDA domains are only available to companies registered as LTDAs where the registration is granted by a governmental body or an organization authorized by the government to issue such registration.