<human>:  What's the difference between a key lime pie and a lemon meringue pie?
<bot>: The main difference between a key lime pie and a lemon meringue pie is the main citrus component. A key lime pie uses key limes, which are slightly more tart and aromatic compared to regular limes, while a lemon meringue pie uses lemons. Additionally, a key lime pie usually has a graham cracker crust while a lemon meringue pie typically uses a pastry crust. Lastly, a key lime pie is usually covered in whipped cream or meringue, while a lemon meringue pie has a meringue topping.