Dr
In short
Dr is an abbreviation for Doctor, used to address someone with a medical degree or a high-level academic qualification.
In plain words
It is a title for people who have finished very long studies. You use it for surgeons and medics, but also for professors who have earned a PhD.
A simple example
If a person named Jane Smith completes her doctorate in history, she can be addressed as Dr Smith. Similarly, a GP at a local clinic will use the title.
Why it matters
It shows that a person has reached a high level of expertise. It helps people know who to trust for medical advice or specialised research.
Easy to mix up
Do not confuse the title with the job; a person can be a doctor by training but work in a different field.