Why does cling wrap stick to itself?

[Sprout]

I was using cling wrap before, helping my mum (mom) do some cooking and was having terrible trouble getting the cling wrap not stick to itself. Mum showed me some tips on how to stop it but I want to know why it happened! Preferably in a pretty easy laungage to understand.

 

[madjz]

There is static electricity that makes it stick to itself.