Are the words in bold interchangeable in this context?

A network is a set of computers that are connected to each other so that information can be shared or sent to one computer to another. It is a global system of interconnected computer networks that/which links device worldwide.

I do not know whether to use which or that, or are they interchangeable?


  • 1
    I think it should be 'devices' in plural.
    – JMB
    Commented Jun 10, 2020 at 13:38

1 Answer 1


In your example, the correct choice is "that". The extract begins talking about "a network", which could be a connection between as few as two computers. The purpose of that sentence is to define the word "network". The next sentence builds on that definition to introduce the idea of a much wider system of networks, one which connects computers worldwide. Consider the sentence

It is a global system of interconnected computer networks that links devices worldwide.

The meaning of the sentence is

That which connects computers worldwide is a global system of networks.

The referent of the word "it" is not the "network" defined in the previous sentence, but a network "which connects computers worldwide."

If the word "which" is used instead, the word "it" might be taken as referring to the simple "network" previously defined.

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