What is the difference usage between them?

[dutich]

what is the difference between the word "which" and "that"
thank you!

[Casiopea]

Welcome, dutich.

In North American English, that is used for retrictive clauses (it restricts the meaning of the noun it modifies), whereas which is used for non-restrictive clauses (it doesn't restrict the meaning of the noun it modifies). For example,

[1] A suitcase that has no handles is useless.

A restrictive clause is an essential part of the sentence it sits within. Omit it and the sentence changes in meaning:

[2] A suitcase is useless. <Are suitcases really useless?>

A non-restrictive clause is not an essential part of the sentence it sits within. Omit it and the sentence doesn't change in meaning, because which means by the way:

[3] The broken suitcase, which (by the way) also has no handles, is useless.

Now, let's omit the non-restrictive clause:

[4] The broken suitcase is useless.

The sentence's core meaning doesn't change.


Does that help so far?

Try here also, World Wide Words: Which versus that

[dutich]

Thank you sir,it is helpful,i get it,good luck.

[Casiopea]

That's great. Glad I could help.