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What exactly is the interest rate that the Fed is going to adjust?
The Fed rate is so important because it sets a cost on lending institutions (banks, credit unions). It is the rate of interest that a bank gets by loaning its cash overnight to the Fed. Presumably, the Fed then loans the cash to other institutions around the world.  The banks loan money to individuals at a higher rate. Savers get a rate between what the Fed gives and what the bank gets. When times are tough the Fed will lower their rate to try to increase the lending that banks do. This is called Qualitive Easing.  The overnight rate is very low right now. That means that the Fed cannot lower rates to try to stimulate the economy. So to enable the Fed to do its voodoo they have to raise rates so that later they can lower them if needed.