Relative Pronouns, which, who, when, that, whose etc are used to highlight essential and non-essential clauses in English.
There is one of the reasons to choose “that” over “which” is its usage of non-essential and essential clauses, for instance
Analogy in English Grammar: [ Ссылка ]
Non-essential Clause
The bridge, which has been recently constructed, saves almost two hours to reach the next town.
Essential Clause
The bridge that comes in our way saves almost two hours to reach the next town.
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