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what does it use for

They are interchangeable in that context.

In this yahoo answer:
Q: What does synchronizing mean and what is it used to do?
A: Probably you have at some time told windows to save the content of a webpage offline, so when you are online it goes out and downloads the latest version of the page.

My question is, are the below two sentences interchangeable in the above context?
1, What is it used to do?
2, What is it for?

Florentia52

I would be be more likely to write "What is it used for?" or "What is it for?" In a written context, the "used to" in "What is it used to do?" is easily confused for "used to" as in "I used to remember things better than I do now."

"Coloring books are for children, and computers are for adults."
"Simplified editions of such great, world-famous novels are published for learners."
"He said he was trying hard not to get into trouble."

Hi, TMR. Welcome to the forum

Parla

Btw, when I heard people say "It’s used to do . ". I think of the phrase "be/get + used to" instead.

I have heard many people say "This is used to make . ", but someone says "This is used for making . ". Which one is correct? Or are both correct?

I’m not a native speaker of English, which means you shouldn’t rely on my interpretations so much, but only the "This is used to make. " makes sense. (Though, note that it holds the potential of changing depending on various contexts and additionally the native speakers here need contexts given to give us learners the best answer possible) I once used to think the same way as you, and see the preposition for as an alternative to the infinitive to. It’s wrong. See the examples below: