When you want to buy a Digital camera online, you must have some knowledge on the specifications of cameras. Therefore, it is a good idea to learn something about them. The first thing you will find is the resolution. This is the parameter that decides how grainy is your picture is going to be.
Being grainy will be a problem only if you are going to enlarge your photographs. If you are going to enlarge them to only to a size of around 4 X 4, you could manage with a camera that has a resolution of less than 5.
However, you must remember that pictures taken with high resolution cameras are heavy. They will take a longer time to download into your computer and when you want to open them they will take a long time to open. However, if you create an enlarged print with one of these pictures, you will never see any grains.