What does noise on digital pictures mean?

[City Situation]

Does it mean the camera doesn't have enough megapixels? I notice when it's darker, it's usually worse. Can you lower shutter speed to improve that when it's dark?

I took a picture at the highest resolution too (2816x2120), in the day time, and it still was grainy/noisy. Resizing doesn't help it.


Side note: I got a CD from a disposable Kodak I developed at Walgreens. The daytime pictures were sharp and weren't noisy at all. They were crisper than the ones from the digital camera. However, the nighttime ones were very very grainy.

 

[CHAPO GUZMAN]

noise is like that shit on your tv when theres no cable.. clean your lens? get a new camera? ive been told to lower shutter speeds it works.. you need a good flash and hold your shit steady/tripod for it to come out clean.

 

[ESCOBAR 92113]

i recently bought a new cam....its a sony 10.1 megapixel something rather. i gots the touch screen its a really nice camera but picks up alot of noise a night and red eye

 

[AllCity Cinemas]

your shutter is to high to the f stop you have set, could be your iso though to, but your shutter is to high your not letting enough light in for the exposure you have. what would it have to do with a dirty lens or a tripod?

 

[AllCity Cinemas]

also try not shooting it so high, your camera might have that option but doesnt mean itll look good, you shouldnt need photos bigger then 1600pixels for covers