The term "Doctor" can refer to different concepts depending on context, but based on your query and the search results, here are two main interpretations:

1. The Doctor in "Doctor Who"

• The Doctor, sometimes called "Doctor Who," is the central character of the long-running BBC science fiction TV series Doctor Who , which began in 1963

• The Doctor is an extraterrestrial Time Lord who travels through time and space in the TARDIS, often accompanied by companions

• The character has been portrayed by multiple actors over the decades, with the current incarnation being the Fifteenth Doctor played by Ncuti Gatwa as of 2023

• The Doctor's real name is unknown; "The Doctor" is a chosen title symbolizing a promise to help and never be cruel or cowardly

• The character regenerates into new forms to allow different actors to portray the role, a biological process unique to Time Lords

• The Doctor is not a medical doctor in the traditional sense but sometimes demonstrates medical knowledge and scientific expertise

2. Doctors as Medical or Academic Professionals

• Outside the fictional character, a "doctor" is generally a person who holds a doctoral degree or is a medical professional qualified to diagnose and treat illnesses.
• The title "Dr." is used as an academic or professional honorific for such individuals.

Summary

• If you are referring to "Doctor" or "Dr." in the context of popular culture, it likely points to the iconic character from Doctor Who , a Time Lord who travels through time and space

• If you mean "doctor" in the real-world sense, it denotes a qualified medical practitioner or someone with a doctoral degree.

If you want information on a specific aspect—such as the actors who played the Doctor, the show's history, or the medical profession—please specify.