<human>:  What are the differences between a lemon and a lime?
<bot>: The main difference between a lemon and a lime is the size and the color. Lemons are larger and more oval in shape with a yellow hue, whereas limes are smaller and rounder with a green hue. Lemons are slightly sweeter and have a higher acid content than limes, making them more tart and tangy. Lemons also have a thicker skin, making them more difficult to juice than limes.