Very simply:
a/an just means 'one of a class'
the means 'you know exactly which one'.
Compare:
- A doctor must like people. ( = any doctor, any one of that profession)
- My brother's a doctor. ( = one of that profession) I'm going to see the doctor. ( = you know which one: my doctor)
- I live in a small flat at the top of an old house near the town hall, (a small flat, there might be two or three at the top of the house — it could be any one of these.
- an old house: there are lots near the town hall — it could be any one.
- the top: we know which top: it's the top of the house where the person lives — a house only has one top.
- the town hall: we know exactly which town hall is meant: there's only one in the town.)
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