In need of help with a few beginner definitions!

[Woodshark69]

I have recently purchased the book Objective-C Programming: Big Nerd Ranch. Before I go on I am not trying to discriminate this book. It is a great book. I just need help with a few of the vocabulary words before I move on. It says that a variable is a place where one piece of data can go. Can someone explain a little more. When I think of variable I think that it means that if you put 100 in as an integer variable the human will jump 100 somethings. Obviously I am a little lost. Any help is great help. Thanks guys!