What exactly is pansexuality? Seems to me that it is the same as bisexuality, no?

Here is a link to read up on Pansexuality.
It will take you to the Wikipage, for those of you at work.
And here is a link read up on bisexuality.
Again, folks at work, have no worries this will not take you to my old college dorm room.
I would love to know what really is the difference? Have I grown out of touch with terminology? Did someone just make up a new word and coin it in a Lady Gaga song or in a movie? Help me please understand the differences.