The use of 'the' for specifying

When we use the, the listener or reader can already identify what we are referring to, therefore the shows that the noun has been specified by the context/situation or grammatically. For example:

3.20.1 Specifying by means of back-reference [compare > 3.10.2]
Something that has been mentioned is referred to again:
Singleton is a quiet village near Chichester. The village has a

population of a few hundred people.

3.20.2 Specifying by means of 'the' + noun + 'of [compare > 3.26.2] The topics referred to (e.g. freedom, life) are specified: The freedom of the individual is worth fighting for. The life of Napoleon was very stormy.

3.20.3 Specifying by means of clauses and phrases

The Smith you're looking for no longer lives here.

The letters on the shelf are for you.