What's the difference between IRR and XIRR?

Words
39
Reading
1 min
Listen
Play
9y

I use Excel 2010 doing my job.
and I wonder what is the difference between IRR and XIRR function.
NPV and XNPV functions also are mystery.

I asked my colleagues some times but no one could explain it clearly.

What's the difference between IRR and XIRR? | Ecency