Whats the difference between granulated and caster sugar?!

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As above. Caster is finer and I know my mum uses it when she's making things like cakes

Granulated is the "normal" sugar people use to sweeten drinks. It's usually the refined, white sort. You could (just) manage to hold a granule of granulated between finger and thumb. Caster is finer and is used in baking and for sprinkling on top of cakes such as sponges. It is very fine grains/granules. A sugar caster is a container for holding fine sugar for sprinkling - hence the name. Icing sugar is a powder.

Use in cooking / baking

Actually nothing.

Granulated sugar has grains similar to sand, caster sugar is a fine powder. You can produce caster sugar by putting granulated sugar in something like a coffee grinder. But beware, because caster sugar is so finely ground, it is unsuitable for sweetening drinks such as tea or coffee, why this should be is another question.

Caster sugar is finer than granulated and icing sugar is finer still. Recipes usually recommend caster because is blends and mixes really easily and gives a finer finish to things like meringues but granulated is fine for most things.

My source is cooking lessons from my mum! Best cake, scone and meringue maker in the world!

Granulated is coarse grains and used in tea etc
Castor is smaller grains and used for baking, not icing as previously answered
Icing sugar grains are so fine they are a powder, and it is this that is used for icing

granulated is what you get over the counter like regular sugar caster is a fine sift power for frosting or icing on cake.

caster sugar is finer than granulated...better for baking so you dont get a grainy batter for cakes etc

Caster is finer

cooking experiences

no difference (except) that it is ground to a finer texture ..you get less volume but the same weight and it blends easier

caster is normal used for icing