Final answer:
Light Mexican-style beers such as Corona and Pacifico are traditionally served with lime, which may have started for sanitation or taste enhancement and became an established serving convention.
Step-by-step explanation:
Typically, lighter and often Mexican-style beers, like Corona or Pacifico, are traditionally served with a wedge of lime. The practice likely originated as a way to clean the top of the bottle or to add a citrus flavor to balance the lighter beer's taste.
It became such a popular combination that now it's almost expected when ordering these types of beers at bars or restaurants. Other beers may be served with limes if they are light, have a low bitterness level, or if the producer suggests a lime can enhance its flavor profile.