Experience in field you would like to enter

[Kitkat]

So I have started go into more depth with some of my research into the programs that I am looking at and came across something interesting and I am assuming important. One of the schools says that they would like to see the student have field experience in the field that they would like to enter. Now I was planning on trying to do this next summer anyway, in order to improve my application, as well as to make sure that this is actually what I want to do with my time. I was wondering if anyone else has come across this in his adventures in applying to grad school.