What are the different types of interest rates?

Without more information, it is very hard to know which
kinds of interest rates you are asking about.  There are many different kinds of
interest rates.

For example, if you are talking about
interest rates and inflation, you could have nominal interest rates and real interest
rates.  Nominal interest rates are the "plain" rates.  If you borrow money at 8%
interest, that is the nominal rate.  The real rate is adjusted for inflation.  To get
it, you subtract the rate of inflation from the nominal interest rate.  So, if you
borrowed at 8% and inflation was 3%, your real interest rate was
5%.

Another type of interest rate is the prime rate (also
called the discount rate).  This is the short term interest rate that large banks (or
central banks) charge to their best and most credit-worthy customers.  This is generally
the lowest possible interest rate.

There are many other
terms for various kinds of interest rates.