While, of course, the goal is to get the exposure right the first time, that isn't always possible. If you're having trouble finding a balance, technology blog Tested teaches us why sometimes overexposing will give you better photos, post-processing, than underexposed photos.
Photo by Dustin Jamison.
While there is a great amount of debate on the subject, Tested does make the good point that if a picture is only slightly overexposed, you can usually bring it back fairly easy in something like Photoshop. If a photo is underexposed, however, you'll end up with a lot of grain and noise after trying to correct it.
Of course, you could always try to remove the noise afterward, but then you end up doing a lot more work than you would have done had you just opted for overexposure in the first place. You don't always have a choice between the two, but if you're stuck in a bind and have to choose the lesser of two evils, Tested recommends overexposure. That said, a lot of photographers do believe that the opposite is true — so share your thoughts and experiences in the comments, and be sure to check out Tested's article for more details on the subject.