What aspect of flight does the term 'touchdown zone' specifically refer to?

The term 'touchdown zone' specifically refers to the designated area on a runway where an aircraft is expected to first make contact with the ground during landing. This zone is crucial for the landing process, as it helps pilots manage their approach and landing performance. The touchdown zone is typically marked and is located within the first segment of the runway to ensure a safe and effective landing. Pilots use this information to gauge their descent rate and adjust their landing techniques to ensure they land safely within this specified area, allowing for a smooth transition from air to ground operations.