Can anyone give me a simple explanation as to what APN means on my mobile when I am trying to set up my email ?

I have a Samsung G600
Can anyone give me a simple explanation as to what APN means on my mobile when I am trying to set up my email ?
It means Access Point Name and it's usually the name of your network, e.g, Orange, O2, etc. Your network provider will be able to give you more specific details, either by phone or on their website. Hope this helps.