Are you thinking of getting an electric bike? If you're female then as well as considerations like price and efficiency, you'll want to consider the style of frame that you prefer.
Some women are happy with a men's style bike with a high crossbar, but many find a low step-through frame is easier to get onto. Some people use an electric bike to commute to work or between meetings - if you'll be riding your electric bicycle in work clothes then you need to think about how easy the bike frame will make this.
It's also worth noting that many men choose a women's style electric bike because it's easier to get on and off, especially as they get older or have minor mobility issues. So called women's electric bikes are suitable for men too.
An electric bike typically has a rechargeable battery which you plug in when you are at home or another location with an electricity supply. When the battery is charged you can use the motor to assist your cycling. You can also use most electric bikes as ordinary pedal bikes when you have the energy.