We're all concerned about privacy these days, and it's sobering to remember that something as simple as taking a photo can reveal a lot about you. The photos you take may be geotagged, meaning that they have GPS co-ordinate embedded into them that give away the location you pressed the shutter. If this concerns you, it is possible to turn off location tagging.
If you lose track of whether location tagging is enabled or disabled, just look to the top of the screen in the camera app. When the feature is enabled, you'll see a crosshair icon in the upper row of buttons so you can see at a glance.