What is the tube that has to go down my throat before they put me under the anastedic

I was calm and 100% sure I wasnt gonna back out of this surgery UNTILL NOW. I had to meet with the Anastegaolgist...lol(I have no clue how to spell that)but anyways he said he wants to put this tube down my throat BEFORE he puts me under. What is it? Why is he doing that? And did any of you have it done like this? Please help me I am scared to death!!!

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