<human>:  What is the difference between a lager and an ale?
<bot>: The main difference between a lager and an ale is the types of yeast used during fermentation. A lager is brewed with a yeast that ferments at a lower temperature, which results in a light and crisp flavor. An ale is typically brewed with a yeast that ferments at a higher temperature, which results in a fuller, more complex flavor with a higher alcohol content.