What to select after IGCSE? A level or AS level...

[ICCWC2015]

I have a question...After finishing IGCSE on Oct/Nov...I'm going to continue with A level....
But what is AS level, A2 ?
Can someone please explain?
THANKS A LOT !

 

[CaptainDanger]

Two separate sessions/years (As + A2= A levels) or doing it in a single go (A levels). Read here : http://www.cie.org.uk/qualifications/academic/uppersec/alevel

 

[leosco1995]

AS is simply the first year of A-levels.
A2 is the second year.