===== Key =====
[[ddsf:public:guidebook:06_append:glossary:start| Return to Glossary ]]

A **Key** is one or more fields within the data type. A key uniquely identifies one instance of a [[ddsf:public:guidebook:06_append:glossary:t:topic|Topic]] from another instance of the same Topic. 

Source: [[https://community.rti.com/static/documentation/connext-dds/5.2.3/doc/manuals/connext_dds/html_files/RTI_ConnextDDS_CoreLibraries_UsersManual/Content/UsersManual/DDS_Samples__Instances__and_Keys.htm | Key ]]