I need help, and I am not sure how to use macros annd IF's

I have a huge data contains of 18,000 rows and working on two worksheets.

Both sheets has the same unique Values which is in ColumnA. I want to copy the Column B of Sheet1 to Column C of sheet 2 if ColumnA of Sheet1 and Sheet2 are the same.
Please note that I may have18,000 entries on sheet 1 and 17,000 entries on sheet 2. So I only want to copy the data that are present in Sheet 2.

Please see attached file as a test.

Thanks a lot.

-Annielle

test.xlsx