The number 8 is called the base and the exponent is called the power.
Here are other examples:
Some practice problems to make sure you understand the concept:
Write the following using exponent form:
Write the following exponents out to show the expanded form (indicating where multiplication is occurring):
3. 62X2Y34. 3*m*m*m*m*n*n*n*n*n*n
Here is a link to a short, but useful video explaining how exponents work (click here) - check it out if you need a little more explanation.