The electrical current in Egypt is 220 volts, 50 cycles alternating current (AC). Most wall outlets take rounded plugs, so North American travelers will need both a converter and an adapter.
If your appliances are dual-voltage, you'll need only an adapter. Don't use 110-volt outlets marked for shavers only for high-wattage appliances such as blow-dryers. Most laptops operate equally well on 110 and 220 volts and so require only an adapter.