Daddy Went Back to Work

My Daddy got to stay home with me for 4 weeks!  But he had to go back to work today.  I am going to miss him all day.  Riley told me that he will still be home every night.  I think Mommy is going to miss him more than me because she said he did a lot for us while he was home.  He is probably going to have to come home and cuddle me for while when he gets home because he will miss me so much.  I wonder what he does  while he is away?  What is work anyway?