What is an APRS transmitter?

Excuse me, could you please clarify what an APRS transmitter is? I'm not entirely familiar with the term and would appreciate a concise explanation. Is it a specific type of radio transmitter used for a particular application, or does it have a broader meaning within the realm of technology? Additionally, are there any notable features or advantages of using an APRS transmitter that sets it apart from other types of transmitters? Thank you for your time and assistance.