When you plug something into a wall receptacle, you probably don’t think too much about how the outlet is wired, but in certain situations it could save your life. Most homes today only have grounded wall receptacles, but behind that faceplate, it might not be wired as it should.
Sadly, some homeowners have replaced ungrounded wall receptacles with grounded ones to accommodate grounded plugs, but this causes a danger of electrocution. Unfortunately, there is no easy way to check the ground unless you employ the services of an electrician.
If you are experienced, you can open up the receptacle and see what the wiring looks like. If there doesn’t appear to be a proper ground, you should either rewire the outlet, which requires a lot of work, or install a GFCI outlet. While these outlets don’t provide you with a ground, you will get protection from a ground fault.