What is the difference between conjunction Which&That

To understand when to use that or which, it’s important to understand clauses. A defining clause (also called an essential clause or a restrictive clause) gives information essential to the meaning of the sentence. That is used in defining clauses. Here’s an example: My bike thathas a broken seat is in the garage. In this sentence, you understand that the speaker has at least one other bike. Specifically, the bike he’s talking about is distinguished from his other bikes by its broken seat. If you removed the clause “that has a broken seat,” you would lose the implication that he owns more than one bicycle, and even if you somehow knew about the other bikes, you wouldn’t know which one was in the garage. Which introduces non-defining clauses. Unlike defining clauses, non-defining clauses (also called nonessential or nonrestrictive clauses) don’t limit the meaning of the sentence. You might lose interesting details if you remove them, but the meaning of the sentence wouldn’t change. Sometimes, these phrases are set off by commas. My bike, whichhas a broken seat, is in the garage.