Icons and letters On the dial ?

[Nikkie]

I know this much that M manual auto is auto but what about the others A,S,P I know S is semi auto because I seen where Rick said it. but apart from auto and manual are the other setting including the icons portrait , landscape , child , close up,Night are these other settings considered to be auto setting just there for a guide or something more. I guess what I am asking is if I want to take landscape and I used landscape setting would that be considered as auto if you know what I mean. I have a Nikon D3100 with kit lens 18-55